|Full Title||Letter, From: Augustus Trowbridge To: Edwin Plimpton Adams, July 7, 1917.|
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
 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.