Highly recommended exchange market. You can simply sell books You won't read again or don't need any longer and buy new ones instead...Website in English, French and German.
ZVAB-the largest professional European cataloge of antiquarian books on the Internet.
Website in English and German.
The following web adresss leads to a publisher with strong emphasis on an ecologically oriented range of themes. Click on ‘Schnellsuche’ for help in English.
Westarp Verlag (German/English)