The Arizona U.S. Geological Survey Topographic and Orthophotoquad Map Collection includes 2,100 maps. Most are 7.5-minute quadrangle (1:24,000-scale) topographic maps. According to the U.S. Geological Survey (USGS) website, maps at the scale of 1:24,000 include information of both natural and manmade features including but not limited to buildings, fences, private roads. A smaller portion of the collection includes Preliminary Editions of the 7.5-minute topographic maps that were derived from the 15-minute quadrangle maps (1:62,500 scale). While according to the USGS Maps Booklet, the 7.5 and 15 minute map series are very similar, due to the dimensions and space restrictions of the 15-minute maps, some features are absent or are more generalized than what is represented in the 7.5-minute maps (USGS website). Because of this greater level of detail, the 7.5-Minute Topo maps replaced the 15-minute topographic maps (USGS website). The 15-minute maps are part of the Government Information Closed Stacks Map Collection. The collection also includes Provisional Editions of some 7.5-minute topographic maps. These were created to accelerate the completions of the large-scale topographic programs (USGS website). Preliminary and Provisional Editions are noted in the “map title” in the collection inventory. This collection also includes Orthophotoquads which are 7.5-minute quadrangle black and white photographic maps created from aerial photography (USGS website). These maps can be used as an alternative to standard maps (USGS website), especially if researchers are interested in photographic features. Maps are named after a city or location within the map’s covered area, but the name does not necessarily reflect the entire contents of the map. Some map boundaries extended beyond the collection’s state-based focus area. In those cases, additional states are indicated in the scope and content field of each map. In addition to this collection inventory, an index of the state is included in the first drawer of the collection. The maps in this collection can be read using a key provided on the map. For an example of a map symbol key see https://www.usgs.gov/media/images/us-topo-map-symbol-file-sample. For more information on USGS Topographic Maps and to view the USGS TopoView database see https://libguides.usu.edu/maps/types. This database allows users to identify a map name and date based on a geographic location (either name or by navigating within a geographic interface).