an introduction to soil study Courtney, F. M. creator Trudgill, S. T. text London Hodder & Stoughton 1984 2nd ed. monographic iv,123p. ill. F. M. Courtney and S. T. Trudgill Includes index Agriculture (General) S591 .C6 1984 0713109955 UOEL 000 20150410124818.0