The cancels are from Azerbaijan, but still interesting area not far from Armenia. Some areas changed jurisdiction.
A)
“…OGRAD” and long tailed serial “a”.
B)
“…SHIRI BAK.” and I think there is a “G.” Which stands for “gorod” which means town.
C)
Baku?
D)
“SALNI BAK. G.” A part of Baku town?
E)
“BALACHA…”?
F)
?
G)
“VARTASHEN” which is nowadays the Oghuz rayon.
H)
“PETROPAVLO…” ?
A = probably PETROGRAD receiver
C = BAKU G. = Baku G[orod] ; Town sub post office
D = SALYANI BAKIN
E = BALAKHANI BAKIN
H = PETROPAVLOVKA BAK
Actually, the “G” stands for Guberniya, these are towns within Baku Guberniya and the psotmarks include the province designation. If the postmark ONLY had a “Baku G” I’d agree that it stands for Gorod.
As for B, I think it’s UDZHARY, BAK.G. since that seems to fit what I can read of the postmark. Do you have the Imperial list of post offices? I’ll be happy to send you an Excel file of them which I find very useful.