A., 1926 viii, 196 p., 21, 10 figs, contemporary hcloth. Title-page of Dacqué missing, first page with repaired tear. Wegener's paper is at the end (pp 171- 193, with ten figures and a separate title-page).
1926 viii, 196 p., 21, 10 figs, paperbound (back broken). Library stamp. Wegener's paper is at the end (pp 171- 193, with ten figures and a separate title-page).