Chang, Raymond
Essential chemistry
McGraw-Hill, 1996
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Stark, Edward C.
Essential chemistry
Glencoe, 1979
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Gormally, John
Essential mathematics for chemists
Prentice-Hall, 2000
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Bradley, Teresa
Essential mathematics for economics and business
John Wiley & Sons, 2002
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Black, J.
Essential mathematics for economists
John Wiley & Sons, 1980
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