General lectures on electrical engineering 2026-02-15T22:07:24+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Steinmetz, Charles Proteus, 1865-1923 (Steinmetz electrical engineering library, 1918)