The bordered photograph featuring Coca-Cola bottles and ice buckets is dated 1949. The bordered photographs of children are dated 1946. The exact date of the photographs without white borders is unknown.
“National Technical Laboratories Company Picnics,” 1940–1949. Beckman Historical Collection, Box 59, Folder 38, 39, 41. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1831cj97b.
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