The Yankee mining squadron

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The North Sea Mine Barrage.
Showing also Foul Ground East of Dogger Bank due to Irregular Minefields.
The 1st to 13th Minefields were American.

THE YANKEE MINING SQUADRON
LAYING THE NORTH SEA MINE BARRAGE
BY CAPTAIN REGINALD R. BELKNAP, U.S.N. The Squadron Commander
ANNAPOLIS, MD. THE UNITED STATES NAVAL INSTITUTE 1920