Sentence:  Other <WSD>sources</WSD> of information include the National Concrete Masonry Association , 38 South Dearborn Street , Chicago , Ill. , the Portland Cement Association , 33 West Grand Avenue , Chicago , Ill. , and the Structural Clay Products Association , Washington , D. C. . 
Meaning of the word marked with <WSD> tags:  a document (or organization) from which information is obtained