Specification of John Thomas Darke
Subtitle: treating sewage
Publisher: Great Seal Patent Office
Published: 1869
Place of publication: London
Language: eng
Subjects: Sewage; Manures; Filters and filtration; Deodorization; Sewage disposal plants
Notes: Cover title.

At head of title: A.D. 1869, 18th March. No.826.

"John Thomas Darke, of Oatlands Park, in the parish of Walton-on-Thames, in the county of Surrey".