La Plata: 301-934-7676
Leonardtown: 240-725-5360
Prince Frederick: 443-550-6060
"Reference sources" can provide helpful background information about a topic and include sources such as encyclopedias, topic overviews, dictionaries, timelines, and bibliographies.
Online resources such as Wikipedia can be a great start, but usually will not be considered reliable. The following databases have background information from credible sources which you can use and cite in your academic assignments.
Keywords for Environmental Studies by 
A Dictionary of Environment and Conservation (3rd ed.) by