251. Letter from Ralph G. Meader to Joshua Lederberg

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252. Letter from Francis J. Ryan to Joshua Lederberg

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253. Letter from David Rittenberg to Joshua Lederberg

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254. Yale Program

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255. Letter from Joshua Lederberg to Francis J. Ryan

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256. Isogenic stocks

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257. Program

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258. Letter from Joshua Lederberg to Lynferd J. Wickerham

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259. Letter from Ralph G. Meader to Joshua Lederberg

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260. Letter from Evelyn Witkin to Joshua Lederberg

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261. Untitled notes on muscle contraction and isotope tests

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262. Letter from Lucille Georg to Joshua Lederberg

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263. Letter from Lucille Georg to Joshua Lederberg

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264. Letter from Lynferd J. Wickerham to Joshua Lederberg

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265. Letter from Joshua Lederberg to Lynferd J. Wickerham

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266. Letter from T. C. Sheng to Joshua Lederberg

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267. Letter from Bernard O. Dodge to Edward L. Tatum

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268. Letter from Barbara McClintock to Joshua Lederberg

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269. Letter from Samuel Graff to Joshua Lederberg

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270. Letter from Hans Ris to Joshua Lederberg

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271. Studies in Bacterial Genetics

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272. Letter from Joshua Lederberg to T. C. Sheng

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273. Letter from Joshua Lederberg to Evelyn Witkin

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274. Letter from Andre Lwoff to Joshua Lederberg

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275. Letter from T. C. Sheng to Joshua Lederberg

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276. Letter from Lynferd J. Wickerham to Joshua Lederberg

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277. Letter from Joshua Lederberg to Francis J. Ryan

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278. Letter from Norman Winer to Joshua Lederberg

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279. Letter from Francis J. Ryan to Joshua Lederberg

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280. Letter from Salvador E. Luria to Tracy M. Sonneborn

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281. Letter from Joseph J. Peters to Joshua Lederberg

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282. Letter from Joshua Lederberg to David Rittenberg

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283. Letter from Tracy M. Sonneborn to Salvador E. Luria

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284. Reverse-Mutation and Adaptation in Leucineless Neurospora

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285. [Laboratory notebook entry], 2 June 1946

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286. Letter from Joshua Lederberg to Sol Spiegelman

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287. Letter from Edward L. Tatum to George W. Beadle

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288. Letter from Sol Spiegelman to Joshua Lederberg

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289. Untitled notes on distinctiveness of genotypes

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290. Letter from Joshua Lederberg to Samuel Graff

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291. Letter from Joshua Lederberg to Sol Spiegelman

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292. Letter from Joshua Lederberg to Francis J. Ryan

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293. Letter from Sol Spiegelman to Joshua Lederberg

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294. Letter from Lucena Barth to Joshua Lederberg

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295. Letter from Joshua Lederberg to Margaret Holden

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296. Letter from Margaret Holden to Joshua Lederberg

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297. Letter from Joshua Lederberg to Harriett Ephrussi-Taylor

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298. Letter from Joshua Lederberg to Aura E. Severinghaus

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299. Letter from Joshua Lederberg to Ralph G. Meader

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300. Studies in Bacterial Genetics: An Interim Report to the Director, Jane Coffin Childs Fund

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