1896-1975 1927- 1927-1989 20thcentury abbey adventure american american-southwest americanauthors americannovelists archesnationalmonument archesnationalpark archesnationalpark(utah) authors babies biography biologists california california_guidebooks children'sfiction cleanliness conservation cowles desert desert-conservation desert-ecology desertecology deserts edward environmental-activism environmental-advocacy environmental-ethics environmental-protection environmentalism environmentalists fiction infants memoir monsters national-parks naturalhistory nature novelists outdoor-exploration parkrangers personal-reflection raymondbridgman solitude southwest southwesternstates unitedstates utah walking wilderness