New York State Museum, Albany, NY.
The American mastodon has long been a popular subject for souvenir postcards. Here is a sample of such cards.
Denver Museum of Nature and Science (formerly Denver Museum of Natural History).
William Penn Memorial Museum, Harrisburg, PA.
Peabody Museum of Natural History, Yale University.
Cleveland Museum of Natural History.
Exhibit Museum, University of Michigan, Ann Arbor.
New Jersey State Museum, Trenton.
Postcards from Rancho La Brea, sold at the Natural History Museum of Los Angeles County and the George C. Page Museum of La Brea Discoveries.