D.C. Investigation. hearings before the United States House Committee on the District of Columbia, Sixty-Ninth Congress, second session, on Feb. 23, 25, 26, 28, 1927. Vol. 2 :

Focuses on D.C. traffic lights purchase and installment contracts administration. Includes transcript of investigative hearings held by the Bureau of Efficiency concerning the furnishing of traffic-signal equipment to D.C. by the Crouse-Hinds Co. on Mar. 17-20, 26, and 27, 1927 (p. 1263-1468).