Gregor Gilpin Beck (Beck, Gregor Gilpin)

• 
  Voices for the Watershed: Environmental Issues in the Great Lakes - St Lawrence Drainage Basin
  by Bruce Litteljohn, Gregor Gilpin Beck
  Hardcover, McGill Queens Univ Pr, ISBN 0773520031 (0-7735-2003-1)
• 
  Watersheds: A Practical Handbook for Healthy Water
  by Gregor Gilpin Beck
  Softcover, Firefly Books Ltd, ISBN 1552093301 (1-55209-330-1)