This document is part of the United States Department of Agriculture's Organic Roots Collection. Organic Roots is a collection of the historic United States Department of Agriculture. The collection contains publications related to organic agriculture. The collection contains documents published before 1942 (before synthetic chemicals became widely used) that contain state-of-the-art information and data that is still very pertinent for today's agriculture. | Some Methods For Detecting Differences In Soil Organic Matter by Us Us Department of Agriculture (Usda), Paperback | Indigo Chapters