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Subject (Genre)
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- Maps22,963
- Statistics14,875
- Legislative hearings9,266
- Bibliography6,572
- Case studies3,887
- Handbooks, manuals, etc3,065
- Biography2,561
- Directories2,461
- Dictionaries2,170
- Topographic maps2,123
- Classification1,961
- Identification1,571
- Pictorial works1,404
- Tables1,235
- Guidebooks1,113
- Catalogs948
- Early works to 1800773
- Laboratory manuals718