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1
by Timmerhaus, Klaus D., Flynn, Thomas M.
Published 1989
Springer US
“..., liquefied hydrogen. Helium, the last of the so-caBed permanent gases, was finally liquefied by the Dutch...”
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2
Published 2007
Springer New York
Table of Contents: “... -- Fifty-Years’ Development of Cryogenic Liquefaction Processes -- Advances in Helium Cryogenics -- Lessons...”