Content Provider
Geological Quarterly
12
University of Lodz Repository (RUŁ)
8
The Repository of the University of Silesia (RE-BUŚ)
5
Unknown
4
Journals University of Lodz
2
MCS University Digital Library
2
Directory of Open Access Journals: DOAJ Articles
1
Portal Czasopism Naukowych (E-Journals)
1
Uniwersytet Zielonogórski: Zielonogórska Biblioteka Cyfrowa
1