What does PTBT stand for?
PTBT stands for "Partial Test Ban Treaty"
How to abbreviate "Partial Test Ban Treaty"?
"Partial Test Ban Treaty" can be abbreviated as PTBT
What is the meaning of PTBT abbreviation?
The meaning of PTBT abbreviation is "Partial Test Ban Treaty"
What does PTBT mean?
PTBT as abbreviation means "Partial Test Ban Treaty"
