"Agriculture." . . "Agronomy." . . . . . . . . . . . "The principles of agronomy a text-book of crop production forhigh-schools and short-courses in agricultural colleges"@en . . . . "The principles of agronomy; a text-book of crop production for high-schools and short-courses in agricultural colleges"@en . "The principles of agronomy; a text-book of crop production for high-schools and short-courses in agricultural colleges" . . "The principles of agronomy : a text-book of crop production for high-schools and short-courses in agricultural colleges in agricultural colleges" . "The principles of agronomy" . . "The principles of agronomy"@en . . . "The Principles of Agronomy : a text book of Crop Production for High Schools and short courses in Agricultural Colleges"@en . . . "The principles of agronomy a text-book of crop production for high-schools and short-courses in agricultural colleges"@en . . . . . . . .