Specification of Robert Blackburn
Subtitle: treating sewage
Publisher: Great Seal Patent Office
Published: 1872
Place of publication: London
Language: eng
Subjects: Sewage; Manures; Filters and filtration; Sewerage; Disinfection and disinfectants; Sewage disposal plants
Notes: Cover title.

At head of title: A.D. 1872, 5th March. No. 671.

"Robert Blackburn, of Exeter, in the county of Devon".