The following is an in-depth analysis involving an organic raw material with a curious name, leonardite. It owes its name to the American geologist Arthur Gray Leonard, the first director of the North Dakota Geological Survey, who significantly contributed with his research to the characterization of this material and its possible uses in agriculture. You can view through this link volume XVII (1963) of the “Proceedings of the North Dakota Academy of Science”, which contains a publication entitled “Humic Acids from Leonardite: a Soil Conditioner and Organic Fertilizer”, signed by the researchers Youngs and Frost, the source of the table below.