1957. Seventh Edition. 560 pages. No dust jacket. Green cloth boards with lettering. Clean pages with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. Pencil markings to front free endpaper. Bookseller sticker stuck to front pastedown. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Lettering is bright and clear. Minor splits to spine ends and corners causing cloth to be frayed. Visible wear and water marks to boards.