Sentence:  Information , application forms , and assistance in filing may be obtained from the Office of Minerals Exploration , U.S. Department of the Interior , <WSD>Washington</WSD> 25 , D.C. , or from the appropriate regional office listed below : 
Meaning of the word marked with <WSD> tags:  the capital of the United States in the District of Columbia and a tourist mecca; George Washington commissioned Charles L'Enfant to lay out the city in 1791