- Bouncing Balls
"Everything you ever wanted to know about rubber (history, biographies, chemistry and conservation)", a site maintained by John Loadman.
"A Brief History of Rubber" (based on Wade Davis, One River 1996), a site maintained by Rhett A. Butler, promoting awareness of environmental issues surrounding rainforests.
Rubber Research and Development Board
"History of Natural Rubber", a site maintained by IRRDB, Kuala Lumpur, Malaysia.