TY  - BOOK
AU  - Hooper,R.Malcolm
TI  - A historical survey of precancels
CY  - Weston, Mass.
PB  - Cardinal Spellman Philatelic Museum
KW  - United States
KW  - Precancels
KW  - Postal History
KW  - Postal Markings
KW  - Bibliographies
ER  -