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Architectural Archives, University of Pennsylvania
Thaddeus Longstreth Collection
102 Meyerson Hall
220 South 34th Street
Philadelphia, PA
United States
phone: 215-898-8323
The bulk of the collection comprises records of Longstreth's architectural practice (111 projects spanning the years 1943 to 1984). The collection also contains a smaller amount of personal material. Longstreth preserved a substantial amount of material related to his collaborations with Richard Neutra, beginning with his work in Neutra's office in California, and concluding with his supervision of Neutra's institutional and domestic commissions in the eastern United States in the 1950s and 1960s.
Individual holding records for this collection are available on the Philadelphia Architects and Buildings website.