Hammond, Rolt. Air survey in economic development / Rolt Hammond - London : Muller, 1967. - x, 246 p.: ill.; 22 cm. Includes bibliographies. LCCN: 67091383 Nat. Bib. No.: B67-9528 Subjects--Topical Terms: Aerial photogrammetry. Dewey Class. No.: 338.9 / HAA 1967