Incoming Resources
- publisher not identified, Barrington, Ill., 1974
- Magna Systems, Learning Seed distributor, McIntyre Media distributor, Barrington, Ill., Chicago, Ill., Orangeville, ON, ©2008
- Magna Systems, Barrington, Ill., 2008
- Rigby, Barrington, Ill., 2001
- EXCEL, Inc., Barrington, Ill., 1987
- Magna Systems, Barrington, Ill., 2003, c1992
- Technical Pub, Barrington, Ill.