1.
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Cambridge, United Kingdom : Cambridge University Press, 2014.
English | G 133 BOT.B |
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2.
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Köln : C. Heymann, c1987.
German | G 941 LEW.D |
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3.
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Oxford : Clarendon Press, 1994.
English | G 311 ODE.I |
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4.
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[Ottawa] : Patent and Trademark Institute of Canada, c1985.
English | G 111 MAY.H |
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