C4.5(1st Edition) Programs for Machine Learning (Morgan Kaufmann Series in Machine Learning) by John Ross Quinlan Paperback, 302 Pages, Published 1992 by Morgan Kaufmann ISBN-13: 978-1-55860-238-0, ISBN: 1-55860-238-0
Advances in Agroecology Soil Organic Matter in Sustainable Agriculture by Fred Magdoff , Ray R. Weil Digital, 412 Pages, Published 2004 by Crc Press Inc ISBN-13: 978-0-203-49637-4, ISBN: 0-203-49637-X