Was Ist Mathematik by Lothar Heffter
1925. No edition remarks. 161 pages. No dust jacket. Pictorial cloth covered boards. Black and white diagrams throughout. In German. Pages are heavily tanned and foxed throughout. Binding remains firm. Boards have light shelf wear with minor corner bumping and crushing to spine ends. All surfaces tanned and sunned, particularly spine. Some additional mild marks and staining.