W. Douglas Pritchard just wanted to send a book as a Christmas gift for a friend serving in Iraq. Now, it looks as if Pritchard could be helping to send potentially hundreds of books to service personnel in Iraq in the coming months, with the support of a Central Tucson bookstore. The project, tentatively dubbed the "Tucson Book Caravan," began to germinate a few weeks ago when Pritchard asked his friend Mark Ballis what he could send as a gift to Ballis' son, 19-year-old Marine Corps Lance Cpl. Morgan Ballis, who is serving in Ramadi. Pritchard, 66, a retired University...