Mount Wilson Observatory and surrounding mountains, ca.1930 

Summit of Wilson Peak, California, ca.1900 

Mount Shasta from Castle Crag State Park, 1900-1930 

On the trail to Wilson's Peak, California 

Snow telescope and the 60-inch tower telescope(?) at Mount Wilson Observatory, ca.1930 

Sierra Madre trail on Mount Wilson, 1886 

Town of Sisson at the foot of Mount Shasta in winter, ca.1900 

Interior view of the observatory that houses the 60-inch reflecting telescope at Mount Wilson Observatory, ca.1930 

Horizontal snow telescope at Mount Wilson Observatory, ca.1930 

Interior view of the snow telescope, showing the coelostat mirrors, Mount Wilson Observatory, ca.1930 

View of Mount San Antonio (also known as Mount Baldy), viewed from San Diemas (or Dimas?) Canyon, 1885 

View of Mount San Jacinto from Mount San Gorgonio, ca.1900 

Exterior view of Lick Observatory on Mount Hamilton, California, ca.1904-1909 

View of the evening clouds hovering over the Los Angeles basin, as seen from Echo Mountain, [s.d.]. 

Rudimentary observatory on Mount Wilson, [s.d.] 

View of Mount San Antonio (also known as Mount Baldy), viewed from the ridge across San Antonio Canyon, Los Angeles County, ca.1885 

View of the evening clouds hovering over the Los Angeles basin and Catalina Island, as seen from Echo Mountain, [s.d.] 

View of the Strawberry Peak above Switzer Camp, Los Angeles, ca.1900 

Exterior view of Lick Observatory on Mount Hamilton, California, ca.1904-1909 

Mount Lowe Railway track and circular bridge, [s.d.]