1946. First Edition. 144 pages. No dust jacket. Blue cloth. Black and white diagrams with black and white photographic plates throughout. Heavy pen annotations and underlining throughout. Text remains readable. Light foxing and tanning to pages and plates. Binding remains firm. Previous owner inscription to front free endpaper. Book sticker to front pastedown. Spine has moderate crushing to edges. Boards have visible corner bumping and moderate edge-wear with noticeable scuffing overall. Lettering remains bright and clear. Faint water staining with markings overall. Book is slightly bowed and forward leaning.