Understanding our EnvironmentR. M. Harrison, A. S. Tomlin, Andrew C. Skinner, H. Geoffrey Hewitt, J. G. Farmer · First published 2007Open the Tome
India, Pakistan and CeylonO. H. K. Spate, O.H.K. Spate, Andrew T.A. Learmonth, B.H. Farmer · First published 1972Open the Tome
