Yale owns several major microfilm collections relevant to research in LGBTQ studies. You can find these in the Microtext Reading Room in the basement of Sterling Memorial Library. There are readers available for viewing and printing and staff to help you as well.
Some of these collections include:
Herstory - Film S850
*Lesbian Herstory Archives Newsletter Collection
*Lesbian Herstory Subject Files
Sex and Gender: Manuscript Records from the Public Service Office, Parts 1 & 2, Empire & Suffrage - Film B18911
Sex and Sexuality, 1640-1940: Literary, Medical and Sociological Perspectives - Film B18917
*These collections are searchable online.