The premier site on the internet for the putt putt enthusiast 

            http://www.nmia.com/~vrbass/pop-pop/

 Landis, Fred, Jet Propulsion. 

http://www.fem.unicamp.br/~em313/paginas/consulte/jet.htm

Steam Boating magazine

http://www.steamboating.com/

Putt Putt Troubleshooting

            http://www.puttputtboats.com/trouble.html

Buy your boats here!

            http://www.timstoys.com/putt-put.htm

Build your boats here!

            http://users.bigpond.net.au/mechtoys/putt.html