The Keystone View Company was a major distributor of stereographic images. The company was started in Meadville, Pennsylvania in 1892 by B. L. Singley, who previously was a salesman for Underwood & Underwood. In 1978, the company's records and inventory of negatives, weighing more than 30 tons, were donated to the UCR/California Museum of Photography at the University of California Riverside, where they are now known as the Keystone-Mast collection.
