I stumbled across a website called Helium, which appears to be an 'upmarket' wikipedia, in the sense that people essentially build it through their own work, but there seems to be more checks in place so that the material is all good stuff.

This is the Weimar Republic article section:

http://www.helium.com/search/search?search_query=weimar+republic&search_context=906

It is a very easy site to navigate, and has a good search function