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This digitised material is free to access, but contains information or visuals that may:
- include personal details of living individuals
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'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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