2nd Hand MERP Sourcebooks detail specific kingdoms or areas in Middle Earth. They usually have large colour maps, details of main towns, people, races, history and time lines. They often contain a few small adventures with an area specific feel to them.
If you are only interested in 2nd Hand Games and nothing else on Legendgames, then try our 2nd hand site at www.2ndhandrpg.com which only lists 2nd hand items usually long out of print and often hard to come by.