Maps 456 Periodicals 109 Congresses 94 History 90 Social life and customs 70 Politics and government 52 Soils 51 more ... Economic conditions 47 Description and travel 44 Forests and forestry 43 Sarawak 43 Social conditions 40 Statistics 37 Soil surveys 34 Ethnology 32 Agriculture 30 Case studies 30 Research 30 Timber 30 Ibans (Bornean people) 27 Malay language 27 Oil palm 27 Iban (Bornean people) 25 Rice 25 Crop zones 24 Environmental aspects 23 Biography 22 Fisheries 22 Economic aspects 20 Trees 20 less ...