The Lawrence J. Fleming Papers consist primarily of correspondence, grant applications, notes, drawings, photographs, articles, promotional items, technical documentation, and other materials showing Fleming's work to establish, maintain, and expand the Arizona Street Railway Museum, including acquiring and restoring three trolley cars (#44, #116, and #504) that ran on the Phoenix Street Railway. Also included are materials documenting Fleming's service to the Arizona Historical Society's Central Arizona Chapter, research on the Fleming and Coyne families, and work with the Central Arizona Air Museum.