The Juan A. del Regato Collection of Jesse W. Lazear Materials contains items compiled by del Regato towards his interest in writing a biography of Jesse Lazear. While a monograph was never realized the collection did provide source material for several articles he authored on the subject of Lazear and the Yellow Fever Commission. The biographical documents he gathered relating to Lazear are primarily photocopied items collected over the course of several years of research. Some documents were provided by members of the Lazear family, some by government agencies, and some by private repositories. Much of the core collection of documents, are from the Philip S. Hench Walter Reed Yellow Fever Collection at the University of Virginia, bearing that library's stamp. The collection includes copies of Lazear's academic records and degrees, army records, photographs, some research data on mosquito inoculation (1882-1900), as well as journal articles, tributes, memorials and other dedications to Lazear written after his death (1900-1970).