General lectures on electrical engineering 2026-02-15T09:39:03+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Steinmetz, Charles Proteus, 1865-1923 (Methuen, Milton Keynes, Open University Press, 2011)