Thorp, Prescott Holden, 1897-1981.
Catalogue of the 20th century stamped envelopes and wrappers of the United States, including an appendix listing price revisions of all 19th century entries as listed in Thorp-Bartels, Century edition. Compiled, completely rev. and edited by Prescott Holden Thorp. Editorial board: Richard C. Dahlem [and others]. - 1st ed. - Netcong, N.J. [1968]
Postage stamps--United States.
Stamped envelopes--United States.
769/.569/73
Catalogue of the 20th century stamped envelopes and wrappers of the United States, including an appendix listing price revisions of all 19th century entries as listed in Thorp-Bartels, Century edition. Compiled, completely rev. and edited by Prescott Holden Thorp. Editorial board: Richard C. Dahlem [and others]. - 1st ed. - Netcong, N.J. [1968]
Postage stamps--United States.
Stamped envelopes--United States.
769/.569/73