1. Halotrichite, szomolnokite, and rosenite from Dolliver State Park, Iowa;Cody;Canadian Mineralogist,1973
2. Museu do Carvão & das Minas do Pejão;Custódio,2004
3. Hydrolysis products of soluble and exchangeable aluminum in acidic soils;Dacal;Soil Science,1975
4. The non marine bivalve fauna of the Stephanian C of North Portugal;Eagar,1983
5. Rare earth elements in a sampled coal from Pirin Deposit, Bulgaria;Eskenazy;International Journal of Coal Geology,1987