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Identification Pictorial works 13 Birds -- 12 Herbs -- 10 Aquarium fishes -- 6 Classification 6 Mushrooms -- 6 more ... Medicinal plants -- 5 Plants -- 5 Therapeutic use 5 Mushrooms, Edible -- 4 Criminal investigation 3 Fingerprints -- 3 Fishes -- 3 Herbs 3 Insects -- 3 Minerals -- 3 Rocks -- 3 Sharks 3 Sharks -- 3 Shells -- 3 Trees -- 3 Animals -- 2 Bird watching -- 2 Birds 2 Butterflies 2 Butterflies -- 2 Criminals -- 2 Encyclopedias 2 Flowers -- 2 less ...