ISBN 0883858266 books & textbook
The Contest Problem Book IX: American Mathematics Competitions (AMC 12) 2001–2007 Contests (MAA Problem Book Series)
Wells, David M. Faires, J. Douglas
American Mathematical Society /2008-12-18 Paperback / 230 Pages
isbn-10: 0883858266 / isbn-13: 9780883858264
