well i am doing a project at school and i call it the history of bowling/ bowling balls. I have most of the history of bowling down but i am left blank with the bowling balls. It can not be realated to anything american so i need international time lines or stuff. also intertational ball pics would help. any sites that have to do with how the bowling ball advanced in non american ways/even bocce balls work.  thanks
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when all else fails, go to your spare ball

Hmm, dunno the exact title (must be something with "bowling", though ), but there is a nice introductory book written by Parker Bohn III and a ghost writer. A large part of the book deals with the sport's history, and also with the development of bowling balls and technical milestones.

I'd suggest to take a look at different bowling books for a ball development overview. Or try to contact large manufacturers. Their PR department should provide you with vital information about ball development.
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DizzyFugu --- Reporting from Germany

"All that we see or seem, is but a dream within a dream..." - Edgar Allen Poe