Rob Arthur] Moonshot: The Astros' Sign-Stealing Left A Fingerprint In The Audio Data : r/baseball
MLB Letter Confirms Yankees Used Technology for Sign Stealing - The New York Times
Sign stealing, The Baseball Codes
Yankees Letter Reveals Past Fine for Sign-Stealing Methods, per Report - Sports Illustrated
Sign of times: Major League Baseball gives OK to electronic pitch calling
New York Daily News back pages 2020 – New York Daily News
What did New York Yankees do -- and does it matter? What you need to know about sign-stealing letter - ESPN
Yankees letter confirms team was cheating in 2015-16, per report
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MLB, Yankees statements on 2017 letter
New York Daily News back pages 2020 – New York Daily News
Sign of times: MLB gives OK to electronic pitch calling