From ""Yankee Doodle"" to the pretentious whimsy of Kathleen Norris (b. 1947), Harmon has chosen over 500 samples of U.S. ""light verse""--and an odd array it is. The obvious contributors are here in force: Nash, Longfellow, Whittier, O.W. Holmes, Eugene Field, Dorothy Parker, David McCord, Phyllis McGinley. And most of the inescapable chestnuts: ""A Visit from St. Nicholas,""