This may be of interest to historians researching internment and detention centers and the history of Japanese Americans, especially on the West Coast.

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Source: United States Army. Signal Corps. Puyallup Wash. Assembly Center - Parcel post and a full postal service is maintained at the Center. Puyallup Washington, 1942. Photograph. https://www.loc.gov/item/2001695911/.
Image Alt Text: Japanese Americans using postal service at Puyallup Assembly Center for letters and packages.