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Isolated blackboard with periodic table, Calcium.

Stock Photo:
Image ID: 99786941
500x414 6.9"x5.8" (72dpi) 102 KB
1000x828 3.3"x2.8" (300dpi) 310 KB
4464x3696 14.9"x12.3" (300dpi) 3.9 MB
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