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| chem4kids.com |
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56761 | 195431 |
| chemistryexplained.com |
|
160838 | 444440 |
| ausetute.com.au |
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125345 | 353177 |
| chemcollective.org |
|
B/D | 1104086 |
| creative-chemistry.org.uk |
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211534 | 901077 |
| ecsdl.org |
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172950 | 197095 |
| particleadventure.org |
|
401691 | 656852 |
| organic-chemistry.org |
|
92275 | 254452 |
| chemicool.com |
|
61658 | 182803 |
| periodictable.com |
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128234 | 252087 |