TY  - BOOK
AU  - Olson, Kenneth
AU  - Olson, V. M.
TI  - Rapid cancelling machines: Data Book Number 1
PY  - 0000///K.F. Olson
KW  - United States | Machine Cancels | Postal Markings | Post Office Equipment | Postal History | 19th Century | 20th Century
ER  -