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The meaning of the Acronym 21B is...

21B is

  • Mount Desert Coast Guard Lifesaving Station / Weather Observation Station, Southwest Harbor, Maine USA

21B is also in:

Acronym Definition Searched: WTF 37643 ICS PA RRV PJH MG 94557 DSP ELICOS 75685 10080 Mebi- 27243 D/NS