Co-operative research on input/output relationships in use of fertilizers in crop production / by Olle Johnsson... [et al.] - [Uppsala] : Organisation for Economic Co-operation and Development, [n.d.] - 99 p. ; 24 cm. ISBN: OBS 10.60 (pbk.) Subjects--Topical Terms: Sulfur in agriculture Dewey Class. No.: 631.88