You can search in Hebrew or Yiddish on catalog, RAMBI, RLIN (Research Libraries Union Catalog) , WorldCat (OCLC Union Catalog) , and most internet search engines including Google if your computer is Unicode compliant, by switching to Hebrew (code HE on the Language Bar. To learn more on how to use Hebrew on your computer, go to the Library's Judaica Collection resource page, and scroll down to section headed Hebrew Computing and Orthography.