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@book{ Spencer1891,
 title = {System der synthetischen Philosophie. IX. Band: Die Principien der Sociologie. IV. Band},
 author = {Spencer, Herbert},
 year = {1891},
 pages = {VIII, 722},
 address = {Stuttgart},
 publisher = {Schweizerbart},
 urn = {https://nbn-resolving.org/urn:nbn:de:0168-ssoar-54677-7},
}