File:Rubber vault cap, London, England, 1915-1925 Wellcome L0065280.jpg - Wikimedia Commons
Birth control: Types, devices, injections, and permanent birth control
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Cervical Cap - YouTube
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Cervical Cap | Birth Control | How It Works & Effectiveness
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Birth Control Before the Pill | American Experience | Official Site | PBS
Cervical Caps and Diaphragms - Dittrick Medical History Center
The Different Types of Birth Control and How to Pick One
Cervical Caps and Diaphragms - Dittrick Medical History Center
Cervical cap - Wikipedia
Birth Control: Forms, Options, Risks & Effectiveness
