The link below takes you to the library's genealogy resources as the landing page. A quick scroll down the page gives you an appreciation for the breadth and depth of their holdings. They range from obits to newspapers, from marriage records to school records, from court records to land records, and more.
On top of that, the staff is available on request to do a basic search of local histories, family genealogies, cemetery records, etc. Although the service is free, donations to the library are appreciated.
If you have Maryland ancestors, check it out.