Media type: E-Article Title: Usefulness of hydrographic and sozological databases in ecological studies of rivers in Poland Contributor: Graf, Renata; Sobkowiak, Leszek imprint: Uniwersytet Mikolaja Kopernika/Nicolaus Copernicus University, 2012 Published in: Ecological Questions Language: Not determined DOI: 10.2478/v10090-012-0011-5 ISSN: 1644-7298 Keywords: Ecological Modeling ; Ecology ; Geography, Planning and Development ; Ecology, Evolution, Behavior and Systematics Origination: Footnote: Access State: Open Access