I would like to point attention to the very useful reference resource found in WorldCat. I had a customer looking for novels written in a particular city that he would be visiting soon. In the Advanced Search mode of WorldCat, I was able to search for the Geographic Place as Subject and narrow that search to the Genre of Fiction. Had I not been a Cataloger, it would not have occurred to me to use this source. Granted there are other resources out there that provide listings by narrow fields of subjects, but at the time, these were unavailable to me. So hurrah for WorldCat, and the catalogers who build it!