Specification of Joseph Judge Hays
Subtitle: treating sewage
Publisher: Great Seal Patent Office
Published: 1871
Place of publication: London
Language: eng
Subjects: Sewage; Filters and filtration; Manures
Notes: Cover title.

At head of title: A.D. 1870, 28th October. No. 2838.

"Joseph Judge Hays, of Hertingfordbury, in the county of Hertford".