201. Letter from Joshua Lederberg to Leonard Krieger

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202. Letter from Joshua Lederberg to Stanley F. Yolles, National Institute of Mental Health

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203. Letter from Kamal Abdou Youssef to Joshua Lederberg

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204. Letter from Meir Yoeli to Joshua Lederberg

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205. Letter from Joshua Lederberg to Kamal Abdou Youssef

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206. Letter from Joshua Lederberg to Jacob Rabinowitz, Yeshiva University

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207. Letter from Frank E. Young to Joshua Lederberg

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208. Letter from Frank E. Young to Joshua Lederberg

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209. Letter from Frank E. Young to Joshua Lederberg

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210. Toward A More Perfect Union: Science and Medicine

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211. Letter from Frank E. Young to Joshua Lederberg

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212. Letter from Frank E. Young to Joshua Lederberg

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213. Letter from Joshua Lederberg to Frank E. Young

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214. Letter from Frank E. Young to Joshua Lederberg

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215. Letter from Joshua Lederberg to Frank E. Young

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216. Letter from Joshua Lederberg to Richard S. Young

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217. Letter from Frank E. Young to Joshua Lederberg

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218. Letter from Joshua Lederberg to Richard S. Young

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219. Letter from Joshua Lederberg to Richard S. Young

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220. Forty Years of Genetic Recombination in Bacteria: A Fortieth Anniversary Reminiscence

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221. Letter from Richard S. Young to Joshua Lederberg

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222. Letter from Joshua Lederberg to J. W. Hopkins

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223. Letter from Richard S. Young to Joshua Lederberg

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224. Letter from Joshua Lederberg to Richard S. Young

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225. Letter from Joshua Lederberg to Richard S. Young

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226. Letter from Joshua Lederberg to Richard S. Young

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227. Letter from Joshua Lederberg to Gilbert S. Omenn

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228. Letter from Joshua Lederberg to Leonard S. Lerman

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229. Letter from Clement J. Zablocki to Joshua Lederberg

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230. Letter from Joshua Lederberg to Richard S. Young

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231. Letter from George Zeidenstein, Population Council to Joshua Lederberg

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232. Forty Years of Genetic Recombination in Bacteria: Postmature Scientific Discovery?

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233. Letter from Joshua Lederberg to Alejandro Zaffaroni, Alza Corporation

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234. Letter from Joshua Lederberg to Peter Medawar, National Institute for Medical Research (UK)

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235. Letter from Lotfi A. Zadeh to Joshua Lederberg

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236. Letter from Joshua Lederberg to George Zeidenstein

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237. Letter from Joshua Lederberg to Alejandro Zaffaroni, Alza Corporation

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238. Edward Lawrie Tatum, 1909-1975

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239. Letter from Joshua Lederberg to Alejandro Zaffaroni, Alza Corporation

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240. Letter from Joshua Lederberg to Stephen Zamenhof

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241. Letter from Stephen Zamenhof to Joshua Lederberg

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242. Letter from Stephen Zamenhof to Joshua Lederberg

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243. Letter from Stephen Zamenhof to Joshua Lederberg

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244. Letter from Joshua Lederberg to Norton D. Zinder

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245. Letter from Joshua Lederberg to Norton D. Zinder

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246. Letter from Norton D. Zinder to Joshua Lederberg and David Perkins

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247. Letter from Joshua Lederberg to Norton D. Zinder

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248. Letter from Stephen Zamenhof to Joshua Lederberg

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249. Letter from Emile Zuckerkandl to Joshua Lederberg

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250. Letter from Emile Zuckerkandl to Joshua Lederberg

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251. Evaluation of the Interest to Phylogeny of Establishing the Amino-Acid Sequence of Active Sites of Enzymes

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252. Letter from Emile Zuckerkandl to Joshua Lederberg

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253. Letter from Joshua Lederberg to William Burrows

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254. Letter from Joshua Lederberg to Osris Stutman

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255. How DENDRAL Was Conceived and Born

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256. Letter from Georg F. Springer to Joshua Lederberg

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257. Letter from Joshua Lederberg to Emile Zuckerkandl

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258. Letter from Solly Zuckerman to Joshua Lederberg

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259. Letter from George W. Beadle to Joshua Lederberg

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260. Letter from George W. Beadle to Joshua Lederberg

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261. Letter from George W. Beadle to Joshua Lederberg

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262. Letter from George W. Beadle to Joshua Lederberg

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263. Letter from Richard Tobin to Joshua Lederberg

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264. Letter from George W. Beadle to Joshua Lederberg

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265. The Second Century of Louis Pasteur: A Global Agenda for Biomedical Research

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266. Letter from George W. Beadle to Joshua Lederberg

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267. Letter from George W. Beadle to Joshua Lederberg

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268. Letter from George W. Beadle to Joshua Lederberg

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269. Letter from George W. Beadle to Joshua Lederberg

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270. Letter from George W. Beadle to Joshua Lederberg

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271. Letter from George W. Beadle to Joshua Lederberg

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272. Letter from George W. Beadle to Joshua Lederberg

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273. Letter from George W. Beadle to Joshua Lederberg

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274. Letter from Joshua Lederberg to George W. Beadle

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275. Letter from Joshua Lederberg to George W. Beadle

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276. Scientists Must Challenge Today's Common Wisdom

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277. Letter from Joshua Lederberg to George W. Beadle

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278. Letter from George W. Beadle to Joshua Lederberg

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279. Letter from George W. Beadle to Joshua Lederberg

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280. Letter from George W. Beadle to Joshua Lederberg

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281. Letter from George W. Beadle to Joshua Lederberg

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282. Letter from Joshua Lederberg to George W. Beadle

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283. Letter from George W. Beadle to Joshua Lederberg

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284. Letter from Joshua Lederberg to George W. Beadle

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285. Letter from Joshua Lederberg to George W. Beadle

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286. Reflections on Scientific Biography

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287. Letter from George W. Beadle to Joshua Lederberg

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288. Letter from George W. Beadle to Joshua Lederberg

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289. Letter from George W. Beadle to Joshua Lederberg

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290. Letter from George W. Beadle to Joshua Lederberg

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291. Letter from George W. Beadle to Joshua Lederberg

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292. Letter from George W. Beadle to Joshua Lederberg

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293. Letter from Benjamin Draper, California Academy of Sciences to Joshua Lederberg

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294. George Wells Beadle

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295. Letter from Joshua Lederberg to George W. Beadle

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296. Letter from George W. Beadle to Joshua Lederberg

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297. Letter from George W. Beadle to Joshua Lederberg

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298. Letter from George W. Beadle to Joshua Lederberg

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299. Letter from George W. Beadle to Joshua Lederberg

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300. Sputnik + 30

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