The New York-New York Hotel and Casino 9-11 Heroes Tribute Collection consists of materials from the "Heroes of 9-11" display that was at the New York-New York Hotel and Casino in Las Vegas, Nevada from 2001 to 2012. The materials primarily consist of more than 5,000 t-shirts left at the memorial by visitors to Las Vegas, mostly from fire departments and law enforcement agencies from around the United States. Visitors left shirts and other items at the memorial as a sign of respect for the men and women who died during the terrorist attacks in New York City and Washington, D.C. on September 11, 2001. The collection also houses memorabilia and other items left at the memorial, including flags, hats, pins, buttons, flowers, and embroidered emblems and insignias. The materials also contain documentation of the memorial, including promotional and press materials, video recordings from the news media, photographs, and newspaper articles.

The Howard Booth Papers are comprised of the personal papers of environmental activist Howard Booth from 1964 to 2017. The collection includes information about Booth's efforts to help turn Red Rock Canyon into a National Conservation Area. Booth was a member of multiple conservation organizations and the collection includes meeting minutes and newsletters from the Toiyabe chapter of the Sierra Club. The collection also contains correspondence, newspaper clippings, official reports, newsletters, and meeting minutes collected by Booth from various environmental organizations. The papers also include numerous photographic slides with handwritten captions Booth took of Red Rock and the surrounding area from the early 1980s to 2000s.