Man's natural environment : a systems approach 2026-02-16T06:08:47+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Russwurm, Lorne H.; Sommerville, Edward (Duxbury Press, 1974)