Sentence:  The shelter illustrated in figure 12 is based on such a room built in a new home in the Washington , <WSD>D.</WSD> C. area in the Spring of 1959 . 
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