SF Presidio National Cemetery 1530a SF Presidio National Cemetery 1530aa SF Presidio National Cemetery 1531a SF Presidio National Cemetery 1533a SF Presidio National Cemetery 1534a SF Presidio National Cemetery 1534aa SF Castro: trolley 1595a SF Castro: trolley 1596a SF Castro: Levis ad 1597a SF Bay Bridge 1598a Marine Mammal Center 1583a Marine Mammal Center 1582a Marine Mammal Center 1542aa Marin Headlands 1542a Marin Headlands 1565a Marin Headlands 1574a Marin Headlands 1577a Marin Headlands 1563a Marin Headlands 1564a Marin Headlands 1561a Marin Headlands 1580a Marin Headlands 1562a Marin Headlands 1581a SF Buena Vista Park 1528a SF Buena Vista Park 1527a SF Buena Vista Park 1526aa SF Buena Vista Park 1526a Kern Westside oil (1602) Central Valley California Aqueduct 1600a Central Valley California Aqueduct 1599a Pyramid Hills, CA oil (1523) Pyramid Hills (1518) Pyramid Hills (1517) McKittrick, CA 1514a Kern Westside oil (1513) Oceanside, CA 1503a Chadron, NE (6a) Chadron, NE (1a) Mesa Verde National Park, CO (4a) Mesa Verde National Park, CO (5a) Black Canyon of the Gunnison NP, CO (2a) Black Canyon of the Gunnison NP, CO (6a) Black Canyon of the Gunnison NP, CO (12a) Colorado Rockies (1a) Canyon de Chelly National Monument 3a