What does O-1 stand for?
O-1 stands for "Observation, 1924-1942"
How to abbreviate "Observation, 1924-1942"?
"Observation, 1924-1942" can be abbreviated as O-1
What is the meaning of O-1 abbreviation?
The meaning of O-1 abbreviation is "Observation, 1924-1942"
What does O-1 mean?
O-1 as abbreviation means "Observation, 1924-1942"
