Charting made easy incredibly easy / 
Ambrose Lou Mary. 
 - Pennsylvania :  springhouse corporation,  1997. 
 - 278p. :  ill. ; 
<br/><br/>includes indexes 
<br/><br/><label>ISBN: </label>9780874349344 
<br/><br/><label>LC Class. No.: </label>RT 50   / .C48 1997