Calculus. 2026-02-16T00:47:19+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Varberg, Dale E.; Purcell, Edwin J. (Edwin Joseph), 1901-; Rigdon, Steven E., 1955 (Prentice Hall, 2000)