From today's NPR's "Writer's Almanac" [Garrison Keillor]):

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On this day in 1923, Robert Frost's poem "Stopping by Woods on a Snowy Evening" was published in The New Republic magazine. It was Frost's favorite of his own poems. Though it's a poem about winter, Frost wrote the first draft on a warm morning in the middle of June. The night before he had stayed up working at his kitchen table on a long, difficult poem called "New Hampshire" (1923). He wrote "Stopping by Woods on a Snowy Evening" in just a few minutes, almost without lifting his pen off the page. He said, "It was as if I'd had a hallucination."
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Whose woods these are I think I know.
His house is in the village though;
He will not see me stopping here
To watch his woods fill up with snow.
My little horse must think it queer
To stop without a farmhouse near
Between the woods and frozen lake
The darkest evening of the year.
He gives his harness bells a shake
To ask if there is some mistake.
The only other sound's the sweep
Of easy wind and downy flake.
The woods are lovely, dark and deep.
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep.

http://writersalmanac.publicradio.org/