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- Botany[remove]50
- London7
- Plants6
- Plants, Medicinal5
- United States5
- Philadelphia4
- Physicians4
- Engelmann, George, 1809-1884.2
- Materia Medica2
- Medicine2
- Missouri2
- Phytotherapy2
- Animals1
- Barton, Benjamin Smith, 1766-1815.1
- Boott, Francis,1
- Botany -- classification1
- Brincklé, William Draper, 1798-1862.1
- California1
- Chemistry1
- Climate1