Specification of George MacKay
Subtitle: purifying water, sewage, &c
Publisher: Great Seal Patent Office
Published: 1875
Place of publication: London
Language: eng
Number of pages: 11
Subjects: Prevention & control; Water Pollution; Sewage
Notes: Cover title.

At head of title: A.D. 1875, 11th January. No. 91.

"George MacKay, of Edinburgh, in the county of Mid Lothian... manufacturing chemist".