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Pankhurst, R. J. 1978. Biological identification : the principles and practice of identification methods in biology : viii, 104.
Paquet, Helene;Clauer, Norbert;Millot, Georges 1997. Soils and sediments : mineralogy and geochemistry : xx, 369.
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Patten, Bernard C. , Sven E. Jørgensen  Bernard C. Patten, Sven E. Jørgensen 1995. Complex ecology : the part-whole relation in ecosystems
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Patten, Bernard C.;Jørgensen, Sven Erik;Van Dyne, George M. 1995. Complex ecology : the part-whole relation in ecosystems : xxx, 705.
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