1942. Reprinted. 96 pages. No dust jacket. Green cloth. Black and white illustrated graphs throughout. Light foxing and tanning to pages. More prominent to text block edges, pastedowns and free endpapers. Mild creasing and staining to hinges. Some slight looseness to binding but pages remain attached. Boards have minor corner bumping and edgewear with mild tanning and scuffing overall. Spine has heavier tanning with soft crushing to ends.