Does anyone know where I can find out some information about vintage Titleist golf balls?  I recently looked in an old golf bag and I found an icosahedron (324 dimples) Titleist Acushnet, and an icosahedron (324 dimples) Titleist Acushnet Pro-Traj.  Is there a book that describes when these older Titleist golf balls were produced, or is there a web site where I can get additional information?  Thanks.