The Question and Answer section for O Pioneers is a great resource to ask questions, find answers, and discuss the novel.
From the text:
The houses on the Divide were small and were usually tucked away in low places; you did not see them until you came directly upon them. Most of them were built of the sod itself, and were only the unescapable ground in another form....
The passage of time would depend upon what chapter in the book your question pertains to. Please advise.
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