Blackwell, William A. creator Author. Grigsby, Leonard L. Author. text mau 1985 monographic eng xvi, 710 pages : illustration ; 25 cm. juvenile William A. Blackwell, Leonard L. Grigsby. Includes index. Bibliography: pages 705-710. وزارة الثقافة ؛ القاهرة ؛ إهداء ؛ 2023. Electric networks 004.65 B5686 0534037712 : 9780534037710 84025843 DLC 841029 20260514112920.0 4260724 eng