QC20.7.G76 A74 1990 Cover painting by Aimee Curtright.

ISBN 981-02-0381-0 

QC174.45.A1 Q36274 1991 Cover photo by Manuel Huerta.

ISBN 981-02-0959-2

Cover "La Belle" paintings by Jessica Curtright.  "Orbiton" symbol courtesy of Global Foundation, Inc.