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- American History (PDF). United States Postal Service. pp. 129–130. ISBN 9780963095251. Retrieved 1 May 2024. "Responses to written questions submitted by...22 KB (2,354 words) - 18:14, 25 May 2024
- (PDF). Washington, D.C.: United States Postal Service. 2022. ISBN 978-0-9630952-5-1. Retrieved November 19, 2022. Publication 100 White, Leonard D. The...199 KB (20,640 words) - 15:24, 22 May 2024