Specification of Joseph Judge Hays : purifying and utilizing sewage.
- Hays, Joseph Judge.
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About this work
London : Great Seal Patent Office, 1871 (London : George E. Eyre and William Spottiswoode)
5 pages, 1 folded leaf of plates : illustrations ; 28 cm
At head of title: A.D. 1870, 20th August. No. 2297.
"Joseph Judge Hays, of Hertingforbury, in the county of Hertford, gentleman".