000
002420000a22001090004500
245
_a
R & D in social reproduction
100
_a
Nikolayev, A.
260
_a
Moscow
_b
Progress
_c
1975
080
_a
338.001.5
_b
N5
041
_a
EN
942
_c
BK
999
_c
109731
_d
109731