August 23, 1941. Burlington Municipal Airport, WPA (Work Projects Administration) Project. This view shows the grading for the new diagonal runway practically completed and the asphaltic emulsion soil stabilization base construction in progress under contract with the Warren Brothers Roads Company of Boston, Massachusetts. This base is being constructed with the natural soil as found on the site using American Bitumuls Company stabilizing emulsion blading the mixtures into windrows after each application and then spreading it back over the same area with one additional application for each two inches in thickness of loose mixed material. The completed base course being 4 1/2 inches in completed thickness.