Dictionary--Encyclopaedia--Handbook 39 Encyclopedias and dictionaries 33 Literature 27 History 26 Novel 25 Research 22 Philosophy 19 English fiction 18 English literature 18 Agricultural economics 17 Biography 17 History and criticism 16 Leafy vegetables 14 Andy Davies 13 Bob Lewis 13 Bob Wilson 13 Fred Fawbert 13 Gerard O`Neil 13 John Stock 13 Melissa Towner 13 Peter Darnton 13 Peter Osborn 13 Roy Thorpe 13 Social sciences 13 Enzymes 12 Methodology 12 Biochemistry 11 Economics 11 Fertilizers 11 Ion exchange in soils 11