Loose leaf paperback with paper fastener binding. Seventh Edition, 1968. 

Rear cover has a moisture mark that has also caused a faint yellowing mark/wave to the last few pages of the book and the paper fasteners have caused a few rust spots - interior is otherwise clean, and no pages are stuck together. A few small marks to textblock; the "binding" is sound.
Minor-to-moderate rubbing, edge/corner wear and the aforementioned mark/wave to rear cover. 

Will be carefully packaged and shipped within 48 hours M-F. [4]