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260 Woodcraft Birch Bark Roll chapter in local natural history. You can count on screech owls, flickers, martins, wrens, flying squirrels, tree mice, and wasps with something like certainty; and there is always a chance of an osprey or a heron nesting on the top, if you happen to live in their country. And of this you may rest assured : the results will continually be a surprise and a pleas- ure,