Answer: In most historic recreations it is a good idea to use easily available local materials just as the original builder most likely would have used. Since this is for raised beds, you could use the local red cedar tree trunks staked into place or perhaps some wide boards. You could also consider cedar shakes if they were available in your area, or local stones such as might have been dug up while preparing the soil. You could also use the "poor man's method" and simply pile the dirt with steep sides to shed the rain.
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