Gr 1-4 These four books that follow the thematic approach to riddles and jokes are lightweight fun for young readers. Some of the riddles tend to stretch the point, such as ``What do cows say when they play hide and seek? Leather or not here I come.'' Others are clever and more original. Al though each book is compiled by a dif ferent author, the consistency in the il lustrations gives the set unity. Cheerful two-color pen-and-ink drawings, one for each two-page spread, add wit and charm. Although these books are not necessary purchases, libraries wishing to add to their riddle collections may want to consider them.Eva Elisabeth Von Ancken, Trinity Pawling School, Pawling, N.Y.