Exercise mermaid /
Bowles, P.,author.
Burns, R. H.,author.
Hudswell, F.,author.
Whipple, R. T. P.
Atomic Energy Research Establishment (Harwell, England),issuing body.
Great Britain.Her Majesty's Stationery Office.
"Aug., 1958."
Sold but not published by H.M. Stationery Office.