.The Nature and Properties of Soils.LyonT.L.and BuckmanH.O.(1937).2.Conservation of the Soil Gustafson A.P.(1937).3.Land Reclamation in Italy:Rural Rivival in the Building of a NationTr.by. O.R.Agrest.Longobardi C.4.Soil Conservation-Bibliography Revised by J.Henderson.Weiland L.H. (1936).5.Moisture and Farming in South Africa.ThompsonW.R.(1936)6.Fruit From Fertilizers Long H.C.ed.(1936).7.Rose Graft:A Guide to Rose Growing.Day H.A.(1937).8.South African Garden Manual D.H.A.(1936)9.Pests of Fruits and Hops.Massec A.M.(1937).10.Woolly Aphis Control. Greenslade R.M.(1936)11.The Biological Control of Insects.Sweetman H.L.(1936)12.Introduction to Research on Plant Diseases RikerA.J.& Riker R.S.(1936).13.Laboratory Outline in Filterable Viruses.Hyde R.R.(1937)14.Sheep Farming .Fraser A.(1937)15.Beekeeping in South Africa.Attridge A.J.(1933)16.Fruit Markets in Eastern Asia.(California A.E.S.Bull.493)CrocheranB.H.&Norton W.J. (1930)17.The Freezing preservation of Fruits.Fruit Juies and Vegetables.TresslerD.K.& Evers C.F. (1936).18.Food Industries Manual.Tressier D.K.& Evers C.F.(1937).The tecnique of Marketing Research.Wheeler F.C.(1937)20.Agricultural Prices thompsonF.L.(1936)21.Sidgwicks Organic Chemistry of Nitrogen,Taylor Rev.T.W.J.&BakerW.(1937)22.Fundamentals Bacteriology Frobisher M.1937)23.Proceedings of Conference on Statistical Methods of Sampling Agricultural Data. (U.S.Agri.dep.Bur.Agri.Econ.Pub.)FrobisherM.(1936).24.Panchayats in India.Drummond J.G. (1937) .
A Fri, study studied this question.