Charlie on the M.T.A. Did He Ever Return? has hit the shelves of independent bookstores and is available from publisher Applewood Books, Commonwealth Editions: http://www.applewoodbooks.com/Charlie-on-the-MTA-P6548.aspx
I am forever grateful to Caitlin Marquis for her amazing illustrations, as well as to Phil Zuckerman and Jennifer Delaney for their belief in the project.