Proceedings of a symposium sponsored by the Soil science society of America and held at the Palmer House in Chicago, Illinois, February 14 and 15, 1968
(1968)
Compte-rendu du premier colloque europeen sur le controle de la nutrition minerale et de la fertilisation en viticulture, arboriculture et autres cultures mediteraneennes, Montpellier 28 Septembbre - 3 Octobre 1964
(1964)
Proc. of the Symp. on Res. into agro-technical methods aiming at increasing the productivity of crops --- arganized by The Agr. Section of the United Nations Economic Commission for Europe. Held at Geneve, Switzerland, 17-21 January 1983
(1983)