A. Choiński1, M. Ptak2
1Institute of Physical Geography and Environmental Planning, Adam Mickiewicz University,
Dzięgielowa 27, 61-680 Poznań, Poland
2Library, Adam Mickiewicz University,
F. Ratajczaka 38-40, 61-816 Poznań, Poland
Pol. J. Environ. Stud. 2009;18(3):347–352