Gupta, A. K. Practical manual for agricultural chemistry / A. K. Gupta and M. L. Varshney. - 2nd ed. - New Delhi : Kalyani Publishers, 1997 - x, 222 p. : ill. ; 22 cm. - V-1 . Subjects--Topical Terms: Agriculture Chemistry Dewey Class. No.: 630.24 / GUP