1950. Reprinted. 176 pages. No dust jacket. Signed by the author. Green cloth covered boards. Black and white photographs and diagrams. Signed with dedication from the author on front free endpaper. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Previous owner's name to front pastedown. Tape marks to endpapers. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. Some mild marks and staining to surfaces.