"Baikonur spaceport. The assembling and testing hangar of carrier rocket Energia. Assembling of the first and second stages."
(Note: the decription refers to multiple photos. This one shows one of the low bays of MIK RN, where only the first stages were assembled.)
"The Energia Blasts Off", Mashinostroyeniye, 1990
Processing by The Energia-Buran Archive