Thomson, J. Turk, W.E. Beesley, M.J.
Frequency conversion - London Wykeham 1969 - 206 p., ill. - Wykeham Technological series .
621.3.018.4 / T5
Frequency conversion - London Wykeham 1969 - 206 p., ill. - Wykeham Technological series .
621.3.018.4 / T5