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Whatman 1004-150 Whatman 1004-150 Qualitative Filter Papers; 15 cm Diameter; Pore Size, 20-25 µ (Pack of 100): Amazon.com: Industrial & Scientific
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Whatman 1001-240 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 240mm Diameter (Pack of 100): Science Lab Qualitative Filter Paper: Amazon.com: Industrial & Scientific
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Amazon.com: Whatman - Papel de filtro (grado 2 V, 100 unidades) : Industrial y Científico
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Whatman 1450-090 Quantitative Filter Paper Circles, 2.7 Micron, Grade 50, 90mm Diameter (Pack of 100): Science Lab Quantitative Filter Paper: Amazon.com: Industrial & Scientific
