Proceedings of a study week on the use of fertilizers and their effect on crop growth, with emphasis on quality and economy, April 10th-16th, 1972
(1974)
Proceedings of the Seventh International Workshop of the Scientific Committee on Pesticides of the International Commission on Occupational Health. Szeget, Hungary, April 15-17, 1986
(1986)
Proc. of a course held at the Joint Res. Centre of the Commision of the European Communities in the Framework of the Ispa-Courses, Ispa, Varese, Italy, 6-10 April 1987
(1989)
A symp. co-sponsored by the division of inorganic chemistry and by the division of biological chemistry at the 171 st meeting of the American Chemical Society, New York, April 7-9, 1978 : Vol. 1-
(1976-)
