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@incollection{ Spencer1891,
 title = {Progress: its law and cause},
 author = {Spencer, Herbert},
 year = {1891},
 booktitle = {Essays: scientific, political, and speculative. Vol. I},
 pages = {8-62},
 address = {London},
 publisher = {Williams and Norgate},
 urn = {https://nbn-resolving.org/urn:nbn:de:0168-ssoar-59887-6},
}