I was looking at some books on diesel engines. I did a search and found 2 books by Nigel with the same title, sort of. They also have different covers. Does anyone know the differences between the two? Or are they just the same book? They do have 2 different ISBN #.Here are the two:1. Marine Diesel Engines: maintenance, troubleshooting, and repair, 1991. ISBN: 0070096120, 2nd edition, approx $25. hardcover, ? pages.2. Marine Diesel Engines, 2003. ISBN 0713667567, 2nd edition, approx $35. paperback, 224 pages.Thanks.