aaaYosemiteisoneofthegemsoftheUnitedStatesNationalParkssystem.NarratedbyexecutiveproducerRobertRedford,this1988documentaryairedontheEmmyaward-winningPBSseriesTheAmericanExperience.ThisaffectionatehistoryofYosemite,whichwas\"discovered\"in1851asU.S.troopshunteddownNativeAmericans,alsoraisesquestionsaboutthefutureofthepark--Am...