
A book paper (or publishing paper) is a paper that is designed specifically for the publication of printed books. Traditionally, book papers are off-white or low-white papers (easier to read), are opaque to minimise the show-through of text from one side of the page to the other, and are (usually) made to tighter caliper or thickness specification...
Found on
http://en.wikipedia.org/wiki/Book_paper

(from the article `papermaking`) Most book papers are made of various combinations of chemical wood pulp; for lower-priced grades groundwood, semichemical, and de-inked wastepaper ...
Found on
http://www.britannica.com/eb/a-z/b/92

Grade of paper suitable for books, magazines, and general printing needs.
Found on
http://www.e-printing.co.uk/glossary.htm

A classification of papers suitable for book printing.
Found on
http://www.encyclo.co.uk/local/20829
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