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22. Reading the landscape; an adventure in ecology.

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23. Edward Palmer, plant explorer of the American West.

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24. Check list of native and naturalized trees of the United States (including Alaska)

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25. Agriculture handbook

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26. Keys to woody plants.

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27. Rocky Mountain naturalists.

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28. Manual of cultivated plants most commonly grown in the continental United States and Canada

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29. Annual field excursion ... itinerary.

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30. Aquatic plants of the United States

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31. John Merle Coulter, missionary in science

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32. Climate and man.

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34. The fresh-water algae of the United States

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