* Webster's New World Pocket Geographical Dictionary; Donald Stewart & Laura Borovac, redactores; Prentice-Hall, Nueva York, 1994; pp. 155-156: "Hudson...river in E N.Y. flowing southward into Upper New York Bay: c. 315 mi."
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* Webster's New World Pocket Geographical Dictionary; Donald Stewart & Laura Borovac, redactores; Prentice-Hall, Nueva York, 1994; pp. 155-156