Washington on foot : : 23 walking tours (with maps) of Washington, D.C., and Old Town Alexandria. [electronic resource] . — New rev. ed. / edited by John J. Protopappas and Alvin R. McNeal.. — Washington, D.C. : : National Capital Area Chapter, American Planning Association and Smithsonian Institution Press,, c1992.. — 224 p. : : ill., maps ; 22 cm.