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Source
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"EPA GULF BREEZE LABORATORY, THE MICRO-BIOLOGY LAB.
TAKING A BACTERIA COLONY COUNT - NARA - 546274."
http://commons.wikimedia.org/wiki/File:EPA_GULF_BREEZE_LABORATORY,_THE_MICRO-BIOLOGY_LAB._TAKING_A_BACTERIA_COLONY_COUNT_-_NARA_-_546274.jpg
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