There are 40 photo albums in this collection, mostly spanning early 1900s to the late 1950s. The dates vary in each album and aren't necessarily in chronological order. Each album may include a range of topics. Common themes are: park rangers and employees, visitors, buildings, infrastructure, and maintenance, geysers and other geothermal features, park wildlife such as bears, bison, and deer. In order to flip through the album, click series link to load all pages.