Nicholson, Harry Helstrip. The principles of field drainage. - Cambridge [Eng.] University press, 1942. - 165 p. illus. 22 cm. "A bibliography of field drainage" : p. 162. LCCN: agr43000073 Subjects--Topical Terms: Drainage--Great Britain. LC Class. No.: S621 / .N5 Dewey Class. No.: 631.6