Timeline by Michael Crichton
Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson
#2
Corazon
Story of the Door
#3
Every print edition of a book has a different ISBN. Check this:
http://www.answers.com/topic/isbn
But here's two, which I multiply with skill and grace!
Timeline: Michael Crichton: ISBN 0375404368
The Strange Case of Dr. Jekyll and Mr. Hyde: Stevenson, Robert Louis: ISBN: 0486424715
For a grand answer of... 182605962714155120
Timeline by Michael Crichton
Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson
#2
Corazon
Story of the Door
#3
ISBNS taken from Book Result on Google (for jekyll) and highest result on Google for Book + Author (for timeline)
345417623 = 35
0486424715 = 76
=
2660
Also, like I champ I paid my 5k.