Books by Opel, Carl
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MS DOS Version 4: Including the Quickstart Tutorial
Author(s): Opel, Carl
ISBN-13: 9780938862345
Publisher: Weber Systems
Format: Hardcover, 0 pages
R: Base System V : Database Fundamentals
Author(s): Opel, Carl
ISBN-13: 9780938862871
Publisher: Weber System
Format: Paperback