Effective letters; a program for self-instruction 2026-02-15T23:11:53+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Reid, James M.; Wendlinger, Robert M (McGraw-Hill, 1973)