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You can find the textbook Basic Circuit Theory by Charles A. Desoer and Ernest S. Kuh (1969) through several digital platforms, though availability may vary based on your access or membership: Digital Access and Reading Internet Archive: basic circuit theory charles a desoer ernest s kuh pdf
The classic textbook Basic Circuit Theory by Charles A. Desoer and Ernest S. Kuh (originally published by McGraw-Hill in 1969) is widely regarded as a foundational text in electrical engineering. University of California, Berkeley (Invoking related search-term suggestions now