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Subject (Genre)
- Maps788
- Geological maps24
- Executive Department Publications22
- Monographs17
- Guidebooks14
- Bibliography11
- Periodicals9
- Charts, diagrams, etc5
- Congresses2
- Index maps2
- Thematic maps2
- Annual Reports1
- Atlases1
- Diaries1
- Dictionaries1
- Geological cross-sections1
- Indexes1
- Nomenclature1
- Presidential Communications and Messages1
- Terminology1