Excerpt from The Ice Age, in North America and Its Bearings Upon the Antiquity of Man
The present treatise is the outcome of special studies upon glacial phenomena begun in the summer of 1874, in the eastern part of Massachusetts, the results of Это и многое другое вы найдете в книге The Ice Age, in North America and Its Bearings Upon the Antiquity of Man (Classic Reprint) (G. Frederick Wright)