| 21. | Birch bark contains betulin, a terpenoid that easily creates deposits in a pulp mill.
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| 22. | Birch bark also contains substances of medicinal and chemical interest.
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| 23. | The main purpose of the sod is to hold the birch bark in place.
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| 24. | A, in this book, is for " Anishanabe artists making birch bark bowls ."
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| 25. | Still others used substitutes like wintergreen oil or birch bark.
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| 26. | They also traded with the Huron for birch bark goods.
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| 27. | Pring's men had found one of their birch bark canoes, which he brought to England.
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| 28. | Even today birch bark remains a popular type of wood for various handicrafts and arts.
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| 29. | The dining room walls are covered in birch bark.
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| 30. | Another focal point of the exhibit is a birch bark canoe made by Micmac artisans.
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