Naturgeheimnis: 6.-8. Tausend Willhelm Bolsche
1906. 311 pages. No dust jacket. Purple cloth with gilt lettering. Printed in German. Pages are lightly tanned and thumbed at the edges, with light foxing. Binding has remained firm. Boards are a little rub worn, slight shelf wear to corners, spine and edges. Corners are a little bumped. Spine ends are mildly crushed. Light tanning to spine and edges.