1959 National Capital Region Mass Transportation Survey
This is the full civil engineering study from the 1959 Mass Transportation Survey of the National Capital Region, the first official federal study to recommend the creation of a mass transit system in the Washington DC area. Prepared by De Leuw, Cather & Company. (Very large file, 45 MB. Some pages are a bit blurry because the original document in the Eisenhower Library was so large it would not fit on a document scanner and photos had to be taken with an iPhone.)
Also see this memorandum for the record of the White House meeting where President Eisenhower was presented with the survey.