This primary source comes from the Records of the Office of the Secretary of Agriculture.
Full Citation: After school, the children call for mail at post office; Historic Images from the Bureau of Agricultural Economics; Photographs of Historic Images Related to Agricultural Activity, 1/1/1980 - 12/31/2005; Records of the Office of the Secretary of Agriculture, Record Group 16; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/after-school-children-post-office, May 7, 2024]