The Hodgepodge and Nonsense books were full of goodies drawn from Emrich's ruminations in the Folklore Section of the Library of Congress. These here Whim-Whams are ""living folklore"" contributed by readers all over the country. Living? . . . they're practically immortal. Who doesn't know ""Birds in the Wilderness"" or ""100 Bottles of Beer on the Wall"" or the umpteenth variations on elephant jokes and knock-knocks. Still grade school wits and desperate camp counselors will want to bone up on the ""minute mysteries,"" magic squares, grass-roots superstitions and autograph book items. Lots of this can already be found on library shelves. . . or duplicated off the top of your head. . . . Still the sheer abundance and sassy illustrations generate a carnival atmosphere.