31. Letter from Larry Gold to Daniel Nathans Publication: Produced: 1 April 1973 Subject(s): DNA Fragmentation Archival Collection: The Daniel Nathans Papers (Profiles in Science)
32. Letter from Maxine Singer to James J. Castles Publication: Produced: 15 January 1973 Subject(s): Job Satisfaction Archival Collection: The Maxine Singer Papers (Profiles in Science)
33. Letter from Debi P. Burma to Maxine Singer Publication: Produced: [18-19 September 1973] Archival Collection: The Maxine Singer Papers (Profiles in Science)
34. Letter from Maxine Singer to Debi P. and Maharani Burma (Chakravorty) Publication: Produced: 24 October 1973 Subject(s): Organization and Administration Archival Collection: The Maxine Singer Papers (Profiles in Science)
35. Letter from Virginia Apgar to Cindy Luginbill Publication: Produced: 17 May 1973 Subject(s): Congenital AbnormalitiesInfantContraceptives, Oral Archival Collection: The Virginia Apgar Papers (Profiles in Science)
36. Letter from Cindy Luginbill to Virginia Apgar Publication: Produced: 22 March 1973 Subject(s): Congenital AbnormalitiesInfantContraceptives, Oral Archival Collection: The Virginia Apgar Papers (Profiles in Science)
37. Letter from Virginia Apgar to Joan Dunkelberger Publication: Produced: 14 June 1973 Subject(s): Learning DisordersRadiation Archival Collection: The Virginia Apgar Papers (Profiles in Science)
38. Letter from Joan Dunkelberger to Virginia Apgar Publication: Produced: 11 April 1973 Subject(s): Learning DisordersRadiation Archival Collection: The Virginia Apgar Papers (Profiles in Science)
39. Letter from Virginia Apgar to Mary Cawthon Publication: Produced: 7 May 1973 Subject(s): Congenital AbnormalitiesInfantPregnancy Archival Collection: The Virginia Apgar Papers (Profiles in Science)
40. Letter from Mary Cawthon to Virginia Apgar Publication: Produced: 22 March 1973 Subject(s): Congenital AbnormalitiesInfantPregnancy Archival Collection: The Virginia Apgar Papers (Profiles in Science)