If you would you like to learn more about coal and biosolids, here are some great books and really cool websites to dig through!
Books:
Holmes, Anita. I Can Save the Earth: A Kid's Handbook for Keeping the Earth Healthy and Green, (New York: Simon and Schuster,1993).
Seabury, Debra L. Earth Smart!, (West NYC: Center for Applied Learning in Education a division of Simon & Schuster, 1994).
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