The Yale Libraries have an extensive collection of books, journals, microfilm, and archival materials relating to LGBTQI+ studies. Materials can be found at several libraries, including SML - the Sterling Memorial Library and Marx Library - the Marx Science and Social Science Library.
Quicksearch and Orbis contain the Yale Library catalog. Search for books about your topic by typing it in the search box above or at the full Quicksearch page here.
Here are some current Library of Congress subject headings (LCSH) concerned with LGBT health. This will give you a sense of what materials are available across the Yale library system.
Gay men -- Medical care
Gay men -- Mental health
Gays -- Health and hygiene
Lesbians -- Medical care
Lesbians -- Mental health
Lesbians -- Health and hygiene
Bisexuals -- Medical care
Bisexuals -- Mental health
Sexual minorities -- Medical care
Sexual minorities -- Mental health
Sexual minorities -- Health and hygiene
Transgender people
Transsexuals -- Medical care
Transsexuals -- Mental health
Transsexuals -- Health and hygiene
Gay youth
Intersexuality
Older gays -- care