Project Sigma : socio-sexual investigations of gay men and AIDS : aims and methods : a thre year study of male gay and bisexual lifestyles.

Date:
[between 1985 and 1990?]

Licence: In copyright

Credit: Project Sigma : socio-sexual investigations of gay men and AIDS : aims and methods : a thre year study of male gay and bisexual lifestyles. Source: Wellcome Collection.

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