31. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

21 July 1934

32. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

23 June 1934

33. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

16 June 1934

34. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

9 August 1933

35. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

1 January 1933

36. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

25 December 1932

37. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

20 November 1932

38. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

27 October 1932

39. Letter from Wilbur A. Sawyer to Margaret Sawyer

Date:

14 October 1932

40. Vaccination against Yellow Fever with Immune Serum and Virus Fixed for Mice

Date:

1932