They include: Weeds Suggest Low Nutritional Values; Weeds Suggest Low Nutritional Values; Changes in Quality of Soil Organic Matter; Soil Humus. . . Chelator of Inorganic Elements; Humus. . . Soil Microbial Product; "Mycorrhiza," I. Mobilizers of Organic Plant Nutrition; "Mychorrhiza," II. Misconceptions Persist. This year's collection is missing March through July; these magazines were not in the Library of Congress' collection.