00958nlm 2200289 450 99645335400331620220120061315.019981209e19991959 uy| 0engUKdrcnuConservation and the gospel of efficiencythe progressive conservation movement, 1890-1920Samuel P. HaysPittsburghUniversity of Pittsburgh Press1999Testo elettronico (PDF) (297 p.)Base dati testualeConservation of natural resourcesUnited StatesHistoryBNCFPolitica ambientaleStati Uniti d'AmericaStoriaBNCF333.720973HAYS,Samuel P.102888cbaITcbaREICATcbaITcbaREICATcbaITcbaREICAT996453354003316EBERConservation and the gospel of efficiency36107UNISA