q=Marx+and+Engelss+thought+of+ecological+civilization&searchType=standard&isFacet=true&view=standard&rows=10&sortWay=score&sortOrder=desc&curlibcode=CYFG&searchWay0=marc&logical0=AND
rows=10&curlibcode=CYFG&searchWay0=marc&logical0=AND
Marx and Engelss thought of ecological civilization