Want Lists
There are a few places where you can post want lists more or less permanently. They can be scanned by booksellers, other collectors, or anyone passing by. It's not really the most efficient method, but you never know, and it doesn't cost anything.
Web Links
Zentrales Verzeichnis Antiquarischer Bücher
You can search directly from the following search forms. Just enter either author or title in the form and click on the search button.