CPC has several subcollections, including newsletters, conference papers, and a list of research projects. The search interface includes a pre-imbedded part of the search query, which is based on standards in titles. Other organizations can do something similar, if they have standard titles or similar elements. Libby provided some examples under Help. Hallman will look at the NCSU files and probably link to them in the UNC-CH help section.
Searches are case sensitive.
Put the term in quotes to prevent stemming. NCSU has found metatags are useful in ranking results. Someone said that they used metatags and it brought up the ranking of their page to sixth, but not to the top. It might be nice to have a search page that has all the collections selected but lets you click on the ones you don't want included. Wild cards can be at the end or imbedded.