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Wes Ulm, "The Defeat of the English Armada and the 16th-Century Spanish Naval Resurgence: A More Detailed Look at the Spanish Armada, its Immediate Results, its Long-Term Effects, and its Lesser-Known Aftermath"

Library of Congress: Hans P. Kraus, "Sir Francis Drake: A Pictorial Biography": "The Beginning of the End: The Drake-Norris Expedition, 1589"