In Rocky Mountain National Park (Ansel Adams, 1941–42)
Jupiter Terrace, Yellowstone (Photochrom, 1902)
Lassen Volcanic National Park, Ranger Naturalist Service (1938)
Leaves, Glacier National Park (Ansel Adams, 1941–42)
Lewis and Clark: Northern Pacific Railway
Liberty Cap, Mammoth Hot Springs (Early Photograph)
Liberty Cap, Mammoth Hot Springs (Photochrom, 1902)
Life at Its Best: National Parks (Dorothy Waugh, 1930s)
Long's Peak, Rocky Mountain National Park (Ansel Adams, 1941–42)
Looking up the Trail at Bright Angel, Grand Canyon (Thomas Moran, 1901)
Lower Falls, Yellowstone (Thomas Moran, 1880)
Mammoth Hot Springs Sketch (Thomas Moran, 1892)
Mammoth Hot Springs, Yellowstone (Thomas Moran)
Military Post and Giantess Group, Yellowstone (1902)
Mirror Lake, Yosemite (Eadweard Muybridge, 1872)
Mirror Lake, Yosemite Valley (Photochrom, c.1900)
Monthly Print Club
National and State Parks: Skiing, Skating, Sliding, Sleighing (1930s)
National Parks and Monuments: Pueblos of the Southwest (1930s)
Near Grand Teton Roadway (Ansel Adams, 1941–42)
Near Otter Cliffs, Mount Desert Island (Frederic Church, 1860–62)
Never Summer Range, Rocky Mountain (Ansel Adams, 1941–42)
New Mexico and Arizona: Travel by Train (1930s)
Norris Geyser Basin, Yellowstone (Thomas Moran, 1892)
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Buffalo Chase, Mouth of the Yellowstone (George Catlin, 1832–33)
Cajon Pass, California, on the Santa Fe
California Pines (William Keith)
Canyon de Chelly (Ansel Adams, 1941–42)
