Primary sources held by the Maryland Room include maps, photographs, oral histories, prints and printed ephemera. These items are in various stages of accessibility.
The Maryland Room map collection consists of nearly 1,000 maps of the state. Included are Maryland Highway Maps and Maryland Geological Survey publications, both from the twentieth century. A useful starting point for Frederick County map research is Frederick County, Maryland: A Brief Survey of Cartographic Information and Sources by Julia Cubit, available in the Maryland Room.
The strength of the Maryland Room photograph holdings is the Carl Brown Collection concentrating on downtown Frederick. Mr. Brown had a special interest in transportation.
The Maryland Room also maintains a Vertical File of newspaper clippings and magazine articles on a variety of local topics arranged by subject and surname. The majority of clippings derive from the Frederick News-Post from the last quarter of the twentieth century.