1. Letter from Roger S. Greene to Alan Gregg Creator: Zhongguo xie he yi ke da xueGreene, Roger S. Date: 21 November 1930 Genre: Letters (correspondence)
2. Letter from Roger S. Greene to Alan Gregg Creator: Zhongguo xie he yi ke da xueGreene, Roger S. Date: 17 March 1930 Genre: Letters (correspondence)
3. Letter from Roger S. Greene to Alan Gregg Creator: Zhongguo xie he yi ke da xueGreene, Roger S. Date: 10 November 1930 Genre: Letters (correspondence)
4. Letter from Roger S. Greene to Alan Gregg Creator: Zhongguo xie he yi ke da xueGreene, Roger S. Date: 27 February 1930 Genre: Letters (correspondence)