Ruczkowski, P. 2021. The cooperation of municipalities (gminas) in the implementation of natural environment protection and management tasks as illistrated by the example of the Ecological Union of the Koprzywianka River Basin Municipalities. Acta Iuridica Resoviensia (formelry: The Scientific Journal of the University of Rzeszow, Law Series). 34, 116 (Sep. 2021), 293–307. DOI:https://doi.org/10.15584/actaires.2021.3.21.