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Whatman quantitative filter paper, ashless, Grade 44 circles, diam. 110 mm, pack of 100 Whatman paper
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Whatman 1001-070 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 70mm Diameter (Pack of 100): Science Lab Qualitative Filter Paper: Amazon.com: Industrial & Scientific
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Whatman 1541-047 Hardened Ashless Quantitative Filter Paper, 4.7cm Diameter, 22 Micron, Grade 541 (Pack of 100): Science Lab Quantitative Filter Paper: Amazon.com: Industrial & Scientific
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