Sentence:  Information , application forms , and assistance in filing may be obtained from the Office of Minerals Exploration , U.S. Department of the Interior , Washington 25 , <WSD>D.C.</WSD> , or from the appropriate regional office listed below : 
Meaning of the word marked with <WSD> tags:  the district occupied entirely by the city of Washington; chosen by George Washington as the site of the capital of the United States and created out of land ceded by Maryland and Virginia