MSA 292, Collection on the 100th Anniversary of the First Official Airmail, first day cover, related stamps and souvenir booklet, Purdue University Archives and Special Collections, Purdue University Libraries.
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MSA 292, Collection on the 100th Anniversary of the First Official Airmail, first day cover, related stamps and souvenir booklet, Purdue University Archives and Special Collections, Purdue University Libraries. https://archives.lib.purdue.edu/repositories/2/resources/1361 Accessed February 17, 2025.