[Friedrich Engels on the use of dialectics by natural scientists (on the 150th anniversary of his birth)].
D005197:Famous Persons; D005858:Germany; D049672:History, 19th Century; D010684:Philosophy / Q000266:history*; D012586:Science / Q000266:history*
Fridrikh Engel's o primenenii dialektiki estestvoispytateliami (k 150-letiiu so dnia rozhdeniia)