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Open University Worldwide ยท 1998 Ppb. ISBN: 978-0-7492-8191-5 ISBN-10: 0-7492-8191-X |
| See also: | ||
| 2007 | Hardcover | Energy (The Physical Sciences) |
| 2006 | Kalender | Energy 2007 |
| 2005 | Kalender | Energy 2006 . |
| 2001 | Hardcover | Energy (Invisible Journeys) |
| 2000 | Paperback | Energy (Invisible Journeys) |