21. 01. English Non Fiction Generating wind power / by Walker, Niki, Publication: St. Catharines, ON : Crabtree Pub., 2007 . 32 p. : , Includes index. 28 cm. Date:2007 Availability: Copies available: (1), Actions:
22. 01. English Non Fiction Harnessing power from the sun / by Walker, Niki, Publication: New York, NY : Crabtree, 2007 . 32 p : , Includes index. 29 cm. Date:2007 Availability: Copies available: (1), Actions:
23. 01. English Non Fiction Native North American wisdom and gifts / by Walker, Niki, Publication: New York ; | St. Catharines, Ont. : Crabtree Pub. Co., 2006 . 32 p. : , Includes index. | "A Bobbie Kalman book" --Cover. 29 cm. Date:2006 Availability: Copies available: (1), Actions:
24. 01. English Non Fiction Hydrogen : running on water / by Walker, Niki, Publication: New York : Crabtree Pub., 2007 . 32 p. : , Includes index. 29 cm. Date:2007 Availability: Copies available: (1), Actions:
25. 01. English Non Fiction Biomass : fueling change / by Walker, Niki, Publication: New York : Crabtree Pub., 2007 . 32 p. : , Includes index. 29 cm. Date:2007 Availability: Copies available: (1), Actions:
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