Series of colour photographs not labelled by Niall, but some appear to be of sugar mills in the Caribbean; Palmer's Mill, Sydney, Australia; Old Mill, Perth, Australia; mill machinery at the Rum Museum, Sainte Rose, Guadeloupe.

Files containing correspondence, photographs, notes, and ephemera on various wind and water mills and related industries in the United States of America, Canada, and the Caribbean. Industries include sugar mills; salt mills; cider mills; dye mills; flax, hemp and textile mills; paper mills; colour mills; whiting mills; rice mills; ironworks; bridges; canals; hydroelectric power; saw mills; tide mills.