This collection is comprised of a memorial book filled with handwritten condolences, memorials, and prayers for the victims of the mass shooting that occurred on October 1, 2017 at the Route 91 Harvest music festival in Las Vegas, Nevada. From October 2-10, 2017, Steve Round watched over a memorial that spontaneously developed in the median of Las Vegas Boulevard near the site of the shooting. Round invited visitors at the memorial, including families and friends of the victims, community members, first responders, and tourists, to sign the book.

The Don T. Walker Photograph Collection (1900-1995) is comprised of black-and-white and color photographs taken by or belonging to Las Vegas photographer and Nevada historian Don Travis Walker. The photographs taken by Walker include ghost towns in Nevada, Arizona, and California, as well as a series on Phil Benson, editor and publisher of the Southern Nevada Times. Other items in the collection include photographs taken by other people related to the Moulin Rouge Hotel in Las Vegas, various photographs of historic sites in Nevada, and a program from the Nevada State Museum and Historical Society for its "Moulin Rouge: History in the Making" exhibition.