Getis,Judith <br/><br/>You can make a difference:help protect the earth  help protect the earth Judith Getis  - Boston,Massachussettes:  Mcgraw-Hill;  [1991]  - vi88pages:  with Illustration;  23 cm. <br/><br/><label>ISBN: </label>0697139239 <br/><br/><label>LC Class. No.: </label>TD 171.7  / .G3943 1991