"Engineering (Electrical)" . . . . . . . . . . "Principles of Direct-Current Electrical Engineering, etc"@en . . . . "[Principles of Direct-Current Electrical Engineering, etc.]"@en . "[Principles of Direct-Current Electrical Engineering, etc.]" . . . . "Principles of direct-current electrical engineering"@en . . . . "Principles of direct-current electrical engineering" . . . . . . . . . . . . . . . "Electricity Currents (Continuous)" . .