Charts of the Illinois Waterway : From Mississippi River at Grafton, Illinois to Lake Michigan at Chicago and Calumet Harbors

wraps : The paper covering on the outside of a paperback.

quarto : A term used generally to describe the approximate size of a book, a book that is about 10" to 12" tall and roughly squarish in shape. The term is based on the size of paper traditionally used by book printers which has been folded and cut into 16 pages.