Books by Sherrill Swan:
Books in the extended shelves:
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Swan, Sherrill: Denver off-peak free fare public transit experiment : interim report, May 1979 : Service and methods demonstration program. (U.S. Dept. of Transportation, Urban Mass Transportation Administration and Research and Special Programs Administration, Transportation Systems Center, 1979), also by Robert Knight, Transportation Systems Center, and Cather & Company De Leuw (page images at HathiTrust)
Find more by Sherrill Swan at your library, or elsewhere.