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1881 Section along 36th parallel … Exploration Book Section along 36th parallel … |
1881 Section along 37th parallel, … Exploration Book Section along 37th parallel … |
1881 III. Carboniferous. Exploration Book Carboniferous. J.C. McConnel … |
1881 IV. Carboniferous. Exploration Book Carboniferous. J.C. McConnel … |
1881 69B, D, 77B, 78A. Parts of A … National Atlas Parts of Atlas Sheets Nos. 6 … |
1881 70A. Parts Of Southern Color … National Atlas Parts Of Southern Colorado A … |
1881 70C. Part Of North Central N … National Atlas Part Of North Central New Me … |
1881 84. Land Classification Map … National Atlas Land Classification Map Of P … |
1881 84C. Land Classification Map … National Atlas Land Classification Map Of P … |