| 11. | If this seems like going overboard, just buy a field guide.
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| 12. | I flipped to the index in my field guide and found the picture.
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| 13. | Also included is a field guide to place sharks into the correct order.
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| 14. | The complete field guide to trees of Natal, Zululand and Transkei.
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| 15. | The tapes are meant to be used with Roger Tory Peterson's field guides.
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| 16. | There are numerous popular books and field guides on the subject of shell-collecting.
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| 17. | In 2003, two smaller, portable Sibley field guides are scheduled to be published.
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| 18. | Several Australian field guides have reported the species from that country.
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| 19. | Identifying a mushroom cannot be done adequately even with a good field guide.
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| 20. | Subsequently, he focused his work on creating and expanding upon birding field guides.
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