Subjects
- Typhoid Fever -- drug therapy21
- United States. Army. American Expeditionary Forces.21
- Water Pollution21
- Zoology21
- Abortion, Induced20
- Abscess20
- Agriculture20
- Biological Phenomena20
- Cardiovascular Diseases20
- Cataract Extraction -- methods20
- Cowpox20
- Criminals20
- Culicidae20
- Dentistry, Operative20
- Digestion20
- Drainage -- methods20
- Drug and Narcotic Control20
- Drugs, Investigational20
- Dyspepsia -- therapy20
- Education, Special20