Investigators know where to go to get our hands on a particular school yearbook. Sometimes they’re found at the school or the local library. But don’t discount state libraries and archives, and state and local historical societies in your search. For example, the Nevada State Historical Society posts a list of the school yearbooks it retains onsite. The librarians in these organizations know their collections quite well and are enormously helpful. When I’ve needed more indepth research at a particular institution, I’ve become a member (the fee is minimal) and received hundreds of dollars worth of essential research. Here’s a example of one way to search more broadly to find school yearbooks. See other sources for yearbooks online at Genealogy Links and Databases.
[UPDATED April 2014]