Barrie Galpin

First Lessons with Graphics Calculator  Barrie Galpin Spiral-bound. A&B Book, 2005-03-01 ISBN 9780954102050     Calculator Graphing  Barrie Galpin Paperback. A&B Book, 2004-03-17 ISBN 9780954102043     Galdin Tapping Into Mathematics with the Ti-83 Graphics Calculator  Barrie Galpin Barrie Galdin Paperback. Addison Wesley Publishing Company, 1998-03-20 ISBN 9780201175479