District of Columbia. Cumulative supplement 4 (Apr. 15, 1929-June 29, 1938) to Code of District of Columbia, containing laws, general and permanent in their nature, relating to or in force in District of Columbia (except such laws as are of application in District of Columbia by reason of being general and permanent laws of United States) enacted by 71st-75th Congresses, with perfecting amendments to Code [and] with ancillaries and index.