Large thick trade paperback. Two volumes in one; 439 and 403 pages respectively. Index at the end of each volume. Illustrated with 148 diagrams and images. Unabridged republication of the work originally published in two volumes. edited by Fritz Sauter. Total of 864 pages. Previous gift inscription inside front cover and minimal crease to spine, else a clean, square, fresh and unmarked copy. Very good or better.