Silphium - Wikipedia
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A Cooperative Method of Natural Birth Control: Margaret Nofziger: 9780913990841: Amazon.com: Books
Silphium, The Ancient 'Miracle Plant' Rediscovered In Turkey
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Silphium: the lost ancient world's herbal birth control -- 2,500 years before modern contraceptives
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Fertility app Natural Cycles becomes the world's first mobile contraception | WIRED UK
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Please Don't Try These "Natural" Viral Birth Control Methods Circluating On Twitter
9 Forms of Birth Control Used in the Ancient World | Mental Floss
The mystery of the lost Roman herb
A Cooperative Method of Natural Birth Control - Nofzinger, Margaret: 9780913990063 - AbeBooks
