"Lowell, USA, Lowell Mill, Floor beams"
"Lowell, USA, Lowell Mill, beams in Visitor Centre"
"Lowell, USA, Hamilton Mills, velvet loom"
"Lowell, USA, Hamilton Mills, concrete & steel"
"Lowell, USA, Hamilton Mills"
"Lowell, USA, Hamilton Steam Mill & Offices"
"Lowell, USA, Appleton Steam Mills"
"Lowell, USA, Suffolk Textile Mill"
"Lowell, USA, Hamilton Canal & Appleton Mill"
"Lowell, USA, Massachusetts Mills"
"Lowell, USA, Massachusetts Mills"
"Lowell, USA, Massachusetts Mills from river"
"Lowell, USA, Massachusetts Mills & Concord River"
"Lowell, USA, Boot Mills & water intake "
"Lowell, USA, Steampowered Boot Mill "
"Lowell, USA, Waterpowered Boot Mills "
"Lowell, USA, Boot Mills from river"