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| 1 | International Conference on Metals in Soils, Waters, Plants, and Animals (Orlando. 1990) Metal ecotoxicology : concepts and applications / edited by Michael C. Newman, Alan W. McIntosh . — Chelsea : Lewis, 1991. — 399 p. : gráf., tab. ; 24 cm. — ( Advances in trace substances research) |  | ||
| 2 | Tamm, Carl Olof Nitrogen in terrestrial ecosystems : questions of productivity, vegetational changes, and ecosystem stability / Carl Olof Tamm . — Berlin : Springer-Verlag, [1991]. — 115 p. : il., gráf., tab. ; 24 cm. — ( Ecological studies ; 81) |  |
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