Worumbo Mills, Lisbon Falls, ca. 1882 - Maine Memory Network
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Worumbo Mill - Wikipedia
Maine History Online - Biddeford, Saco and the Textile Industry
How Maine’s Samuel Mayall Brought America its First Woolen Mill - New England Historical Society
The Mayall Mills: History: Discover History & Explore Nature: State Parks and Public Lands: Maine ACF
Peek inside Maine Woolens' Textile Mill in Brunswick
Maine Woolens