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Beginning in 1947 research provided new evidence about the ocean floor , and in 1960 Bruce C. Heezen published the concept of mid-ocean ridges .
 Bruce C. Heezen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Bruce C. Heezen