Proton launches in 1991
February 1991
14 Feb
Kosmos 2133
Proton28 Feb
Gran' #38L
Proton
March 1991
31 Mar
Almaz 1
Proton
April 1991
4 Apr
Kosmos 2139
Proton
July 1991
1 Jul
Gorizont #34L
Proton
September 1991
13 Sep
Kosmos 2155
Proton
October 1991
23 Oct
Gorizont #35L
Proton
November 1991
22 Nov
Kosmos 2172
Proton
December 1991
19 Dec
Gran' #39L
Proton