Charting made incredibly easy. 
Charting made incredibly easy. 
 - Pennsylvania  Springhpouse  1998 
 - vi, 277p.: ill.; 24cm. 
<br/><br/><label>ISBN: </label>0 - 87434 - 934 - 6. 
<br/><br/><label>Dewey Class. No.: </label>610.73  / C31C