1955. Sixth Edition. 628 pages. No dust jacket. Blue cloth. Black and white illustrations and photographs throughout. Pages are moderately tanned with noticeable foxing throughout. Cracks to hinges, exposing netting. Binding is loose causing pages to be shaky. Tape staining to pastedowns and endpapers. Annotations, underlining, and marginalia throughout. Water staining to top text block edge. Boards have light shelf-wear with corner bumping. Visible tanning to spine and edges with some crushing to spine ends. Faint marks overall. Book is bowed and forward leaning.