TY  - BOOK
AU  - Trepel, Scott R
AU  - Trepel,Scott R.
TI  - U.S. postmarks and cancellations
SN  - 0911989269
U1  - 769.56/7/0973 20
PY  - 1992///
CY  - New York
PB  - Philatelic Foundation
KW  - Postmarks
KW  - United States
KW  - Cancellations (Philately)
N1  - Proceedings of the U.S. Postmarks and Cancellations Seminar, held in New York, N.Y., Nov. 1-2, 1990
ER  -