Colorado Rockies (1a) Black Canyon of the Gunnison NP, CO (12a) Black Canyon of the Gunnison NP, CO (6a) Black Canyon of the Gunnison NP, CO (2a) Mesa Verde National Park, CO (5a) Mesa Verde National Park, CO (4a) Chadron, NE (1a) Chadron, NE (6a) Oceanside, CA 1503a Kern Westside oil (1513) McKittrick, CA 1514a Pyramid Hills (1517) Pyramid Hills (1518) Pyramid Hills, CA oil (1523) Central Valley California Aqueduct 1599a Central Valley California Aqueduct 1600a Kern Westside oil (1602) SF Buena Vista Park 1526a SF Buena Vista Park 1526aa SF Buena Vista Park 1527a SF Buena Vista Park 1528a SF Presidio National Cemetery 529a SF Presidio National Cemetery 1530a Canyon de Chelly National Monument 5a2 Canyon de Chelly National Monument 5b Canyon de Chelly National Monument 1a Canyon de Chelly National Monument 1b Family 1501 Family 1499 Family 1498 Family 1497 Family 1496 Aztec NM 198a Angels Peak, NM 193a Angels Peak, NM 195a Chaco Culture National Historical Monument 185a Chaco Culture National Historical Monument (188) Chaco Culture National Historical Monument (191) Bisti Wilderness 168a Very Large Array National Radio Astronomy Observat… Very Large Array National Radio Astronomy Observat… US180 (3327) Mogollon, NM 3340a Mogollon, NM 3334a Mogollon, NM 158a