It took one year but finally I can offer something new for german players: the german manual. Since GOG only provides the english version some may want to take a look into the "original" one. The file isn't as beautiful as the english one but I think it fulfills its purpose.

https://dl.dropboxusercontent.com/u/3304508/settlers_3_manual_german.pdf

In earlier retail versions there was a sheet with overviews of some chain productions. So if you want to have them you can visit my old post.

http://www.gog.com/forum/the_settlers_series/settlers_3_original_production_sheets_in_german_language_for_download