'The control of soil fertility', Harpers
Tags: 1910s; 1915; 1915-4-1; Abandoned farms; Agricultural chemistry; Applied Chemistry; Bru�re, Robert W. (Robert Walter); Chemistry; Economic conditions; Farmers; Research; Soil fertility; United States
'The scientist and the food problem', Harpers
Tags: 1900s; 1903; 1903-11-1; Baker, Ray Stannard; Chemistry; Hydroponics; Nitrogen Cycle; Nitrogen in agriculture; Nobbe; Nutrition; Plants; Research; Soil fertility
atom, dcmes-xml, json, omeka-xml, rss2
