
1) City in Connecticut 2) City of North America 3) City in North America 4) City in the US 5) City in the Americas 6) City of Connecticut 7) City of the United States 8) City in the United States 9) City of the Americas 10) City in the USA 11) City of the US 12) City of the USA 13) Connecticut submarine base
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https://www.crosswordclues.com/clue/groton

1) Prep-school
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https://www.crosswordclues.com/clue/groton
[Amtrak station] ==History== In May 1852, the New London & Stonington was chartered to build a railroad from Stonington to Groton, completing the last major section of the `Shore Line` rail link from Boston to New York City. The NL&S failed in early 1857 and was combined with the New Haven and New London Railroad into the New Haven, New Lon...
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http://en.wikipedia.org/wiki/Groton_(Amtrak_station)
[village] The Village of Groton is near the center of the Town of Groton and is northeast of Ithaca and west of Cortland. == History == The village lies within the former Central New York Military Tract and was first settled by outsiders around 1795. Before then, the only purpose of the land surrounding Groton was to host the winding trails...
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http://en.wikipedia.org/wiki/Groton_(village),_New_York

city and town (township), New London county, southeastern Connecticut, U.S., on the east bank of the Thames River, opposite New London. In 1649 a ...
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http://www.britannica.com/eb/a-z/g/73

town (township), Middlesex county, Massachusetts, U.S. It is located on the Nashua and Squannacook rivers, about 35 miles (56 km) northwest of ...
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http://www.britannica.com/eb/a-z/g/74

The USS Groton was an American frigate of 1430 tons displacement launched in 1944. The USS Groton had a top speed of 20 knots and carried a complement of 194. She was armed with three 3 inch dual-purpose guns; four 40 mm anti-aircraft guns and four depth-charge throwers.
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http://www.probertencyclopaedia.com/browse/RG.HTM
No exact match found.