《四区四线和三区三线》AmericanfilmcriticElvisMitchell’skaleidoscopicdocumentarycreatesadefinitivenarrativeoftheBlackrevolutionin1970scinema,fromgenrefilmstosocialrealism—aworkofpainstakingscholarshipthat’salsothoroughlyentertaining,anessentialarchivaldocumentandtestamenttoaperiodofAmericanfilmhistoryunlikelytoberepeated.