Subject
- H. K. Mulford Company1
- Haanel, Eugene, 1841-19271
- Hand pumps1
- Hatch, K. L. (Kirk Lester), 1871-1
- Heat1
- Heat--Conduction1
- Helmholtz, Hermann von, 1821-18941
- Hemoglobin1
- Henry, Joseph, 1797-18781
- Herbert H. Dow House (Midland, Mich.)1
- Herbs1
- Herbs--Therapeutic use1
- High-density polyethylene1
- Historians of science1
- Hoechst AG1
- Home economics--Study and teaching1
- Honey1
- Hooker Chemical Corporation1
- Household pests1
- Hughes, Regina O. (1895-1993)1