The book "Juden in Karlsruhe" is not available anymore, out of print. But you can download a digital version.
Unfortunately, I forgot where I downloaded it, but I have it (Hardcopy of course and as a pdf). It is too big to send it via email but I can upload it to Google and send the link to whoever would like to have it.
Just send me your email addresses and I will make it available for you, together with a few more books about Jews in Karlsruhe and Baden.
David Seldner, Karlsruhe, Germany