The University of California, Riverside, California Museum of Photography maintains the world's largest collection of original stereoscopic prints and negatives. The Keystone-Mast Collection represents the archive of the Keystone View Company of Meadville, PA (active from 1892-1963). Its 350,000 items offer an encyclopedic view of world history and cultural diversity. Up to now, access remained a manual process of physically examining the company's original file prints and deteriorating ledgers.

In 1998, the National Endowment for the Humanities, division of Preservation and Access funded the museum's first large-scale Keystone-Mast cataloging project. This project is known as the "Stereographs of the Americas" (SOA). SOA is a detailed illustrated record, documenting the sites, events, and cultures of the Western Hemisphere. The two-year project produced approximately 18,000 digitized images and 24,000 searchable data records.

These entries are just the beginning. A second wave is currently gaining momentum. UCR/CMP inaugurated its IMLS/Museums and Online Archives project entitled "Special Topics" on January 1st of 2000. This project will produce thousands of world-views by stereographers such as George Lewis, F. White, Harry L. Sanders, J. C. Sawders, B. L. Singley and other unique stereographic views. These special files will include "Prominent People" and "Indians." The museum's long-range goal is to continue forging a comprehensive online illustrated catalog, wave after wave, until all of the Keystone-Mast Collection is completely accessible.