An edition of Sir William Petty's Atlas, published in Dublin by Grierson in 1732, will be offered for sale at tomorrow's National Book Fair at the Masonic Hall, Molesworth Street, Dublin. Containing 36 maps of the 32 counties and four provinces and valued at around £9,000, the atlas is being offered by De Burca Rare Books. De Burca is also bringing to the fair a 1925 letter written by James Joyce to an American journalist friend of the author. The fair starts at 10 a.m.