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Photograph of a manned horse and buggy taken at the American Powder Mill. (Note shadow of view camera and photographer at bottom.)

Photograph of a man and horse taken at the American Powder Company mills. (Note shadow of photographer and view camera at bottom of frame.)

Photograph of the American Powder Mill Office showing a fireplace and safe.

Photograph of the Powder Mill Office. (Note the display on the left wall for the Winchester Repeating Arms Company with the shells forming the "W".)

4 scenes of the Power House at Powder Mill, late 1800s to early 1900s. Show's electric generator/dynamo, boilers, powerhouse exterior, and a possibly a steam-driven engine of some sort.

Photograph of the (American) Powder Mills taken in the late 1800s or early 1900s.

Photograph of the Powder Mill (American Powder Mill) showing some of the mill buildings and a horse and buggy delivery.

Men employed at American Powder Mill, early 1900s

Label used to mark gunpowder kegs.

This was the property of Charles J. O'Neil, and is inscribed with his name.

Mr. Charles J. O'Neil was one of five men killed in an explosion at the old Powder Mills in Acton; May 2, 1895.

A copy of the Maynard Enterprise-Thursday May…