Q. I cannot figure out where to look to get information on Sumeria/Sumerians and Natufians which were Neolithic people.

Go to library.ship.edu.  Click on Databases A-Z in the left column.  Click on Gale Virtual Reference Library.  Enter natufian (don't add the S).  This will result in the full text of articles from specialized encyclopedias.  The first and third hits are the useful ones.  Then search for Sumerian.  Also try natufian sumerian to get articles with both.  Use Ctrl F to go directly to the part of the article that mentions specific words you are interested in. 

Go back to library.ship.edu and click on ShipLibraryWorldCat,org under Explore Library Books in the middle of the page.  Search natufian as a keyword.  This will result in the same article from Encyclopedia of Anthropology that you found in Gale Virtual Reference Library.  The rest are actually journal articles available in full text in our databases. When Check Online Resources comes up, click on any of the links to View Full Text.  If you search for Sumerian, you'll find some books we have that might also talk about Natufians. 

You can find more articles in journals by selecting E and then EBSCOHost from the A-Z list.  Then leave Academic Search Complete selected, but also scroll down and select Historical Abstracts and SocINDEX. 

If you have any trouble with this, please see a reference librarian in person.