TY  - BOOK
AU  - Simpson,Tracy Whittelsey
TI  - Simpson's U.S. postal markings, 1851-61
SN  - 9780960354801
AV  - 79067627 
U1  - 769.56/7 
CY  - Columbus, Ohio
PB  - U.S. Philatelic Classics Society
ER  -