Subject (Genre)
- Popular works228
- Tables208
- Laboratory manuals199
- Textbooks173
- Documentary films153
- Problems, exercises, etc151
- History148
- Juvenile literature111
- Observations100
- Maps, Physical97
- Annual Reports93
- Monographs92
- Alexander Street Video73
- Early works72
- Instructional television programs70
- Documentary television programs69
- Handbooks and manuals67
- Legislative Report - Public Bills67
- Congress66
- Handbooks65