I always used site:print.google.com
and still works

It just doesn't work together with the old syntax to find books anymore – see
http://www.google.com/search?hl=en&lr=&c2coff=1&q=test+site%3Agoogle.com+inurl%3Aisbn&btnG=Search

I always used to watchsee this to read oldest as wellas wellknown writers books for reading,which is very important information for book lovers like me,keep it up.