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Old 07-26-2020, 05:39 PM   #32
AKD
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There is a bit of technical information on Hedgehog (and ASDIC / SONAR use generally) in this post-war USN sonarman training manual (mind you some aspects only concern tech that was deployed at the very end or after the war):

https://play.google.com/books/reader...en&pg=GBS.PA44
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