A grade of paper used in the printing of text and trade books, as well as a variety of other types of printed materials. They are similar to text paper, but are usually less expensive, and come in a wider variety of basis weights and bulks, which aids in choosing the right thickness of paper depending on the desired ultimate book thickness (see Bulk). Finishes range from antique to smooth. There are also coated book papers and groundwood book papers, depending on the finish and cost desired.
The basic size of book papers is 25 x 38, and come in basis weights of 30, 40, 45, 50, 60, 70, 80, 90, 100, and 120-pound. Standard sizes are 17H x 22H, 19 x 25, 23 x 29, 23 x 35, 24 x 36, 25 x 38, 28 x 44, 32 x 44, 35 x 45, 38 x 50, and 42 x 58.