H-DC / DC History

Most of these can be found at the Washingtoniana Division, DC Public Library, the Library of the Historical Society of Washington DC/City Museum, Library of Congress.

Baseball in Washington DC

Books

Bealle, Morris Allison. The Washington Senators, an 87-year history of the world's oldest baseball club and most incurable fandom. Columbia publishing company, c1947.

Casway, Jerrold I. Ed Delahanty in the emerald age of baseball University of Notre Dame Press, 2004

Ceresi, Frank. Baseball in Washington, D.C. / Frank Ceresi, Mark Rucker, Carol McMains. Arcadia Pub., 2002.

Deveaux, Tom. The Washington Senators, 1901-1971. McFarland & Co., c2001.
H-DC Review

Hartley, James R. Washington's expansion Senators (1961-1971) / James R. Hartley. Corduroy Press, c1998.

Judge, Mark Gauvreau. Damn Senators : my grandfather and the story of Washington's only World Series championship. Encounter Books, 2003.

Kelley, Brent P. "I will never forget" : interviews with 39 former Negro league players McFarland, 2003

Kerr, Jon. Calvin : baseball's last dinosaur : an authorized biography. Wm. C. Brown Publishers, c1990.

Povich, Shirley. The Washington Senators. Putnam, [1954]

Roberts, James C. Hardball on the Hill : baseball stories from our nation's capital. Triumph Books, c2001.
H-DC Review

Snyder, Brad. Beyond the shadow of the Senators : the untold story of the Homestead Grays and the integration of baseball. Contemporary Books, c2003.

Thomas, Henry. Walter Johnson: Baseball's Big Train. Phenom Press, 1995.

Willis, C. Norman. Washington Senators' All-Time Greats. Xlibris, 2003.

Primary Sources: 

Minnesota Twins scrapbooks, 1937-1981 [microform]. 
St. Paul, Minn. : Dakota Microfilm Service,
[198-?]. Description: 14 microfilm reels.
Notes: Use copy duplicated by the Minnesota Historical Society from master microfilm negative loaned for copying by the Minnesota Twins Baseball Club, Minneapolis.
Mostly newspaper clippings documenting the history of the Minnesota Twins baseball team (1960-1981); ts predecessor franchise, the Washington Senators (1953-1960); and farm clubs operated by the Washington Senators, the Charlotte Hornets of the Piedmont League (1938-1940), and he Chattanooga Lookouts of the Southern Association (1937). There is also information about the teams' owners, Clark C. Griffith and Calvin R. Griffith.
A roll list is available in the repository; filed as M442. 
Location: Minnesota Historical Society, St. Paul, MN.
Control No.: MNHV900023437-A

MS 0594
Edmund F. French baseball scrapbook and memorabilia, 1859-1871. (MS 594).
Description Scrapbook and memorabilia documenting the history of the National Baseball Club in Washington, D.C. Includes the club's 1859 constitution and the 1867 revision, as well as cigar bands, clippings, invitations, menus, ribbons, and tickets.
Founding member and player of the National Baseball Club, Washington, D.C., and clerk, U.S. Treasury Department.
Location: Historical Society of Washington, D.C.

Websites and Articles online

Baseball in D.C. (MLB)

D.C. ballparks

D.C. Baseball Heritage

Earl Gillespie's site

Washington Post Senator's history

AU Eagle Senator's history

Race and Baseball in D.C.

Wikipedia entry

Baseball As America

Yahoo Discussion Group: The Washington Senators