Leech, D. D. T. 1., & Nicholson, W. L. (1879). The Post Office Department of the United States of America: Its history, organization, and working, from the inauguration of the Federal Government, 1789, to the close of the administration of President Andrew Johnson. Washington: Judd & Detweiler.

Leech, D. D. T. 1810-1869., and Walter L. Nicholson. The Post Office Department of the United States of America: Its History, Organization, and Working, From the Inauguration of the Federal Government, 1789, to the Close of the Administration of President Andrew Johnson. Washington: Judd & Detweiler, 1879.

Leech, D. D. T. 1810-1869., and Walter L. Nicholson. The Post Office Department of the United States of America: Its History, Organization, and Working, From the Inauguration of the Federal Government, 1789, to the Close of the Administration of President Andrew Johnson. Washington: Judd & Detweiler, 1879.