The Day of the Pelican Katherine Paterson Clarion, $16, 160 pages; ages 10 and up The Unfinished Angel Sharon Creech HarperCollins, $15.99, 164 pages; ages 8-12 What a book-rich month October has become. Two more Newbery Medal authors have new titles, right on the heels of Kate DiCamillo's "The Magician's Elephant." Both Katherine Paterson, best known for "A Bridge to Terabithia," and Sharon Creech, author of "Walk Two Moons," have written books with the theme of "finding home." But the stories couldn't be more different. "The Day of the Pelican" follows a family of Albanian Kosovars as they flee a brutal "ethnic cleansing" campaign by the Serbs in 1998. Meli Lleshi believes she started her family's troubles when she drew a caricature of her teacher, Mr.