|Full Title||Letter, From: Augustus Trowbridge To: Edwin Plimpton Adams, July 7, 1917.|
|Date Added||20 June 2014|
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 p. Autograph letter signed by Augustus Trowbridge, Sent to Adams in London, from Princeton New Jersey. Written on "Palmer Physical Laboratory, Princeton University, Princeton, New Jersey" letterhead stationary. In the letter, Trowbridge asks Adams to consider taking a commission to study sound ranging. Digitally Donated by Michael Foight.