[042-15]Facies Analyses of the Niagaran Rocks
Lowenstam, Heinz A. Facies Analyses of the Niagaran Rocks 042-15-print
[045-19]Some New Observations on Niagaran Reefs in Illinois
Lowenstam, Heinz A. Some New Observations on Niagaran Reefs in Illinois 045-19-print