Identification Birds 107 Trees 81 Pictorial works 78 Classification 69 Fishes 48 Plants 38 more ... Fungi 36 Botany 35 Wood 26 Insects 25 Orchids 25 Timber 25 Bacteria 23 Handbooks, manuals, etc 20 Marine fishes 20 Diseases and pests 19 Weeds 19 Geographical distribution 18 Wild flowers 18 Grasses 17 Butterflies 15 Mammals 15 Mushrooms 15 Diagnosis 14 Microbiology 14 Atlases 13 Sharks 13 Technique 13 Anatomy 12 less ...