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Chemical formula written on blackboard with chalk.

Stock Photo:
Image ID: 121217581
Copyright:
Small
500x291 6.9"x4.0" (72dpi) 190 KB
Med
1000x581 3.3"x1.9" (300dpi) 767 KB
Large
5184x3012 17.3"x10.0" (300dpi) 10.5 MB
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