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[null,"1.","Record Nr.",null,"UNINA9910711561203321"]
[null,null,"Autore",null,"Hotchkiss Willard E (Willard Eugene), <1874-1956, >"]
[null,null,"Titolo",null,"Mechanization, employment, and output per man in bituminous-coal mining / / by Willard E. Hotchkiss [and seven others]"]
[null,null,"Pubbl/distr/stampa",null,"Philadelphia, Pennsylvania : , : Work Projects Administration, National Research Project : , : Department of the Interior, Bureau of Mines, , 1940"]
[null,null,"Descrizione fisica",null,"1 online resource (2 volumes (xxx, 436 pages)) : illustrations"]
[null,null,"Collana",null,"Mineral technology and output per man studies ; ; report no. E-9"]
[null,null,"Soggetti",null,"Bituminous coal industry - United States"]
[{"$nulls":4},"Bituminous coal mines and mining - Labor productivity - United States"]
[{"$nulls":4},"Coal miners - Effect of technological innovations on - United States"]
[{"$nulls":4},"Coal-mining machinery - United States"]
[{"$nulls":4},"Coal miners"]
[{"$nulls":4},"Coal-mining machinery"]
[{"$nulls":4},"Statistics."]
[{"$nulls":4},"United States"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,null,"Note generali","\"Work Projects Administration, National Research Project, in cooperation with Department of the Interior, Bureau of Mines.\""]
[{"$nulls":4},"\"August 1939.\""]
[{"$nulls":4},"No FDLP item number available."]
[null,null,null,"Nota di bibliografia","Includes bibliographical references."]