TY  - BOOK
AU  - Engels, Frederick.
AU  - Dutt, Clemens.
TI  - Dialectics of nature
U1  - 335.4112 
PY  - 1954///
CY  - Moscow
PB  - Progress pub.
KW  - dialectical materialism
KW  - russia
N1  - Includes bibliographies and index
ER  -