[Paddlewise] crooked knife

I recently read a book by John McPhee titled "Survival of the Birchbark
Canoe". McPhee describes how the canoe builder, a thoroughly disagreeable
man but a fine, intuitive craftsman, uses a tool called a 'crooked knife'.
He uses this in place of a drawknife. Does anyone know what a crooked knife
is and where one might be obtained?
John

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