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Books about Gerdien:
CHARACTERISTICS OF THE ARC IN A GERDIEN-TYPE PLASMA GENERATOR by M T DOOLEY (1961)
THE DEVELOPMENT OF A GERDIEN CONDENSER FOR SOUNDING ROCKETS, by David A. Burt (1967)
A subsonic Gerdien condenser experiment for upper atmospheric research (ASL-CR) by Richard S Sagar (1978)
Improved data reduction and analysis system for blunt probe and Gerdien condenser measurements (ASL-CR) by Darryl C Schroder (1980)