'The Contraceptive Safe Period.' A Clinical Study by Stephen Fleck, Elizabeth F Snedeker and John Rock, published by Massachusetts Medical Society

Date:
1940
Reference:
SA/FPA/NK/233/16

Licence: In copyright

Credit: 'The Contraceptive Safe Period.' A Clinical Study by Stephen Fleck, Elizabeth F Snedeker and John Rock, published by Massachusetts Medical Society. Source: Wellcome Collection.

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