Allegheny and Monongahela Rivers and Tributaries. Letter from the Secretary of the Army transmitting a letter from the Chief of Engineers, Department of the Army, dated January 23, 1953, submitting a report, together with accompanying papers and illustrations, on preliminary examinations and surveys of, and review of report on the allegheny and Monongahela Rivers and tributaries, for navigation, flood control, and allied purposes, made pursuant to several congressional authorizations listed in the report.