Topographic map. Hamburg, PA 15.0 Quad. (1 : 62500). U.S. Geological Survey: Topographic. 1911 (1920), 1911 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Harrisburg, PA 15.0 Quad. (1 : 62500). U.S. Geological Survey: Topographic. 1899 (1929), 1899 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Hazleton, PA 15.0 Quad. (1 : 62500). U.S. Geological Survey: Topographic. 1893 (1910), 1893 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Helms West Well, TX 7.5 Quad. (1 - 24000). U.S. Geological Survey: Topographic. post 1947 & pre 1955, 1947 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Hueco Mountains, TX 15 Quad. (1 : 31250). U.S. Geological Survey: Topographic., 1943 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Hueco Mountains, TX 15 Quad. (1 : 31250). U.S. Geological Survey: Topographic., 1943 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Hueco Mountains, TX 15 Quad. (1 : 62500). U.S. Geological Survey: Topographic., 1943 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Hueco Mountains, TX 15 Quad. (1 : 62500). U.S. Geological Survey: Topographic., 1943 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Hueco Tanks, TX 15 Quad. (1 : 62500). U.S. Geological Survey: Topographic., 1944 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.
Topographic map. Hueco Tanks, TX 15 Quad. (1 : 62500). U.S. Geological Survey: Topographic., 1944 Bookmark Collection Context Yale University -Yale Peabody Museum of Natural History Division of Invertebrate Paleontology Archives, 1861-2014MapsUSA.