1679, John Dryden, Oedipus: A Tragedy, page 59:My fingers are responsible, but my coronary heart is free. This is a free program license but it is incompatible with the GPL. Delta Sigma Theta proven Delta Towers in the northeast spot of Washington, D.C. In 1953, Delta Sigma Theta was the to start with African-American organization to order a countrywide headquarters site found at 1814 M St. NW in Washington, D.C.