A novel by Nevada Barr (Putnam hardcover, $24.95, ISBN: 0399147020, 1/2001; Berkley paperback, $6.99, ISBN: 0425183750, 2/2022) The latest entry in this excellent series featuring National Park Service ranger Anna Pigeon is one of Barr\u27s best. Anna has been assigned to work temporarily in Montana\u27s Glacier National Park, where she seems more at home than in her recent forays to East Coast parks, and learns how to do DNA studies on wildlife by working with a biologist, Joan, on a study of grizzly bears. Anna, Joan and a young, inexperienced volunteer, Rory, are sent out into the park\u27s wilderness areas to set lures for the grizzlies. They use a powerful and nasty-smelling concoction, mixed with cow\u27s blood, that the grizzlies fin...