The concept of heat and its workings simply explained 2026-02-15T14:55:07+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Mott-Smith, Morton Churchill, 1877-1944 (Dover ;, 1962)