cam a22 u 4500 128722789 CHVBK 20200921070219.0 880212s1981 xxu | 00 |eng|d 0-295-95719-0 (OCoLC)888813444 (NEBIS)000245896 ETH-BIB ger ETH-BIB ETHICS-ISBD xxu xxk Aquatic ecosystems an operational research approach : (rev.version of: Ecosystems; Thesis TU Copenhagen 1976) Jan E.Beyer Seattle - Wash.& London University of Washington Press 1981 IX, 315 p. 22 cm fig.; tab.; diagr. HYDROORGANISMEN (AUTÖKOLOGIE) ger (ETHUDK)000021457 ethudk u HYDROORGANISMEN (AUTÖKOLOGIE) ger 574.522 nebis E1 u HYDROBIONTS (AUTECOLOGY) eng 574.522 nebis E1 u ORGANISMES AQUATIQUES (AUTOÉCOLOGIE) fre 574.522 nebis E1 Beyer J.E. BK020000 XK020000 XK020000 NEBIS E01 E01 MG 833580 NEBIS 700 1- Beyer J.E.