From the book Concord Sketches: Consisting of Twelve Photographs from Original Drawings by May Alcott. Published in Boston by Fields, Osgood & Co. in 1869.

Accompanying caption:
"By the rude bridge that arched the flood,
Their flag to April’s breeze unfurled,
Here once the embattled farmers stood,
And fired the shot heard round the world."
-Emerson’s Hymn, Sung at the Completion of the Monument.

via Flickr https://flic.kr/p/QURacm