R. E. Hummel. Electronic Properties of Materials. An Introduction for Engineers. Springer‐Verlag, Berlin – Heidelberg – New York – Tokyo 1985, 319 pages, 219 figures, 30 tables, DM 116.–, ISBN 3‐540‐15631‐3 Springer‐Verlag Berlin – Heidelberg – New York – Tokyo, ISBN 0‐387‐15631‐3 Springer‐Verlag New York – Berlin – Heidelberg – Tokyo