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Chemical formula written on blackboard with chalk.

Stock Photo:
Image ID: 120430930
Copyright:
Small
500x334 6.9"x4.6" (72dpi) 216 KB
Med
1000x667 3.3"x2.2" (300dpi) 897 KB
Large
5184x3456 17.3"x11.5" (300dpi) 13.0 MB
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