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Is there any work in English that gives a systematic treatment of Soviet/Russian rocket engines?
There seems to be some piecemeal information online such as RussianSpaceWeb.com, and of course, Sutton's History of LPRE gives an anthropological treatment of Soviet/Russian rocket engine lineup ...
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Was the R-7 the first two stage rocket of the Soviet Union?
The first US two stage rocket was bumper, a combination of a german V2 liquid fuel rocket with an US second stage.
The Soviet Union had the R-1 and R-2 based on the V-2.
In this list, the R-7 is ...