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Subject
- African American scientists2
- African Americans2
- Apgar score1
- Apgar, Virginia, 1909-19741
- Bissell, Emily P. (Emily Perkins), 1861-19481
- Cachets (Philately)4
- Carson, Rachel, 1907-19641
- Carver, George Washington, 1864?-19432
- Commemorative postage stamps5
- First day covers (Philately)4
- Postage stamps5
- Postmarks4
- Science on postage stamps5
- Seals and labels (Philately)1
- Women in science2
- Women in the social sciences1
- Women physicians1
- Women scientists1