The Earthworks Group

English

• 
  50 Simple Things Kids Can Do to Recycle
  by The Earthworks Group
  Hardcover, Bt Bound, ISBN 0785706798 (0-7857-0679-8)
• 
  You Can Change America
  by The Earthworks Group
  Softcover, Bathroom Readers Pr, ISBN 1879682435 (1-879682-43-5)

Spanish

• 
  Los Ninos Salvaremos La Tierra
  by The Earthworks Group
  Softcover, Selector S.A. De C.V., ISBN 9706432310 (970-643-231-0)