History of Dirt/Enduro/MX

[ZRX12R]

Does anyone have an idea what the "first" MX/Enduro/dirt Bike was ?

I am trying to find links to the history of the development of the mentioned type of bikes but cannot find too much.

Any info would be apppreciated.

TX

[Bad Dad]

This place might be able to help

http://www.ama-cycle.org/museum/