BACKSTAGE PASSES.

Published to commemorate the program's 30th anniversary, David Borgenicht's Sesame Street: Unpaved relates the story of Sesame Street's creation as an educational send-up of TV advertising ("This show is brought to you by the letters W, S and E!") to behind-the-scenes accounts of classic scenes involving Ernie, Bert, Mr. Hooper et al. The book is aimed above the heads of the children currently watching the show, at Gen-Xers who miss the simpler days of cookies, milk and the Children's Television Workshop. The question of why Snuffleupagus's identity was finally revealed is put to rest. …