What does OP stand for?
OP stands for "Ordnance Pamphlet"
How to abbreviate "Ordnance Pamphlet"?
"Ordnance Pamphlet" can be abbreviated as OP
What is the meaning of OP abbreviation?
The meaning of OP abbreviation is "Ordnance Pamphlet"
What does OP mean?
OP as abbreviation means "Ordnance Pamphlet"
