Hello i'm a fan of Tractors and found this Traktorenlexikon while searching the German Wikipedia.de for Lanz tractors.
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I have lots (1000 +) Photos (Foto) of tractors which may be useful for WikiBooks:Traktorenlexikon on Tractor & Construction Plant Wiki a similar project in English that I started. It also covers collecting old tractors, Shows and Fairs, trucks and steam tractors and portable engines, with the history of the companies who built them.
Foto from Tractor Wiki can be used here as Wikia is GFDL licensed.
Any Information on German tractors manufacturers would be welcome at Tractor Wiki with details of any individual tractors or collections and Museums with tractors in.
I can also be found on the English Wikipedia - User:BulldozerD11.