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chemistry formula, drawing with chalk on a blackboard

Stock Photo:
Image ID: 102837677
Release Information: N/A
500x393 6.9"x5.5" (72dpi) 151 KB
1000x785 3.3"x2.6" (300dpi) 624 KB
4770x3744 15.9"x12.5" (300dpi) 8.5 MB
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