An analysis of domestic and foreign PABX markets /

[Washington] : U.S. Dept. of Commerce, Office of Telecommunications : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976

An analysis of domestic and foreign PABX markets /

[Washington, D.C.] : U.S. Dept. of Commerce, Office of Telecommunications, 1976

An analysis of domestic and foreign PABX markets /

[Washington, D.C.] : U.S. Dept. of Commerce, Office of Telecommunications : For sale by the Supt. of Docs., U.S. G.P.O., 1976