Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym 21M is...

21M is

  • Curriers Seaplane Base, Greenville Junction, Maine USA

21M is also in:

Acronym Definition Searched: WGRF PDS WGB 50470 RICS RIT 80328 WP APE 65769 PLIF AJ OMG LAND WISX