The Mercantile Library will feature an exhibit of one of the rarest books in North America. Only 11 copies of the Bay Psalm Book, printed in 1640, still exist. It will be sold at auction at Sotheby's in November. The pre-sale auction estimate is between 15 and 30 million dollars. In addition to the book, other early New England imprints, maps and prints will be on display. The public exhibit for the Bay Psalm Book is this Friday, September 13th, from 10 AM to 4 PM. The Mercantile Library is located on the campus of the University of Missouri St. Louis.