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Subject
- Hitchcock, Edward, 1793-1864 -- Correspondence (22)
- Geologists -- United States -- 19th century -- Correspondence (21)
- Silliman, Benjamin, 1779-1864 -- Correspondence (21)
- Hitchcock, Edward, 1793-1864 -- Health (3)
- Geological specimens (2)
- Religion and science (2)
- Silliman, Benjamin, 1816-1885 -- Correspondence (2)
- Association of American Geologists and Naturalists (1)
- Footprints, Fossil (1)
- Footprints, Fossil -- Catalogs and collections (1)
- Footprints, Fossil -- Massachusetts (1)
- Fossils -- Catalogs and collections (1)
- Fossils -- Classification (1)
- Geological surveys -- New Hampshire (1)
- Hitchcock, Orra White, 1796-1863 -- Death and burial (1)
- Hitchcock, Orra White, 1796-1863 -- Health (1)
- Lyell, Charles, Sir, 1797-1875 (1)
- Macculloch, John, 1773-1835 (1)
- Mantell, Gideon Algernon, 1790-1852. The wonders of geology (1)