1991 - Correspondence Box 31, Folder 2 Collection Context USF Libraries - Tampa Special Collections Dr. Charles S. Mahan papers, 1949-2023, Date acquired: 01/10/2010, bulk 1982-2001…
1991 – Divergence Box 47, Folder 45 Collection Context USF Libraries - Tampa Special Collections Charles Sheffield papers, 1977-2002…
1991 – Divergence parts 1-5 (novel) Box 29, Folder 1 Collection Context USF Libraries - Tampa Special Collections Charles Sheffield papers, 1977-2002…
1991 – Divergence (reviews) Box 29, Folder 2 Collection Context USF Libraries - Tampa Special Collections Charles Sheffield papers, 1977-2002…
1991 - Dog Fly and Mosquito Control Box 27, Folder 24 Collection Context USF Libraries - Tampa Special Collections Dr. Charles S. Mahan papers, 1949-2023, Date acquired: 01/10/2010, bulk 1982-2001…
1991 Enero- Febrero- Marzo- Abril- Mayo- Junio Folder 2 Collection Context FIU Special Collections The Cuban Human Rights Collection, 1983-2004, Date acquired: 2005, bulk 1990-1999…
1991 - Epilepsy Foundation Box 27, Folder 25 Collection Context USF Libraries - Tampa Special Collections Dr. Charles S. Mahan papers, 1949-2023, Date acquired: 01/10/2010, bulk 1982-2001…
1991 - Family Planning Box 27, Folder 26 Collection Context USF Libraries - Tampa Special Collections Dr. Charles S. Mahan papers, 1949-2023, Date acquired: 01/10/2010, bulk 1982-2001…
1991 – Fat Man's Gold Box 47, Folder 46 Collection Context USF Libraries - Tampa Special Collections Charles Sheffield papers, 1977-2002…
1991 - Fetal Infant Mortality Review Program Box 31, Folder 3 Collection Context USF Libraries - Tampa Special Collections Dr. Charles S. Mahan papers, 1949-2023, Date acquired: 01/10/2010, bulk 1982-2001…