1.
Biological Farmer : A Complete Guide to the Sustainable and Profitable Biological System of ...
by Zimmer, Gary F., Zimmer-Dur...
ISBN: 9781601731340
2.
Advancing Biological Farming: Practicing Mineralized, Balanced Agriculture to Improve Soils ...
by Gary F. Zimmer & Leilani Zi...
ISBN: 9781601730190
List Price: $25.00
3.
Advancing Biological Farming : Spanish Version
by Zimmer, Gary F., Zimmer-Dur...
ISBN: 9781601731760
List Price: $35.00