These 30 ready-to-color illustrations reflect the past — and future — of environmentally friendly energy sources. Ranging from ancient Greek and Roman water wheels and medieval windmills to modern solar steam engines, they depict a variety of nonpolluting methods of generating power. Captions identify the illustrations.
|Availability||Usually ships in 24 to 48 hours|
|Author/Editor||A. G. Smith|
|Grade level||3 and Up (ages 8 and up)|
|Dimensions||8 1/4 x 11|