Only type as much of which you are certain. Use either the equal sign or a space after the command when entering a search. Enter author's last namefollowed by the firstname or initial if known. Institutions and organizations can also be authors. Order must be exact.
Subject searches use pre-determined, offical vocabularies.
In the Catalog, separate subject divisions with double hyphens. If you have difficulaty, try a keyword search instead. Then determine the offical subejct termsfrom the records found. It does not mater if you include the periods or not. Keyword Searching Searching by keyword gives you added search capabilities and more flexibility.