Fertilizers and economic development /
Parker, Frank Wilson,1897-author.
Calder, Ritchie,1906-1982,former owner.StEdNL
Food and Agriculture Organization of the United Nations.
Presented to the Fertilizer Workshop of the American Society of Soil Science, February 1962.
Includes bibliographical references (pages 33-34).
Fertilizers.
Manures.
Crop yields.
Economic development.
Crop yields.
Economic development.
Fertilizers.
Manures.