The Central States, 1909
The central states, showing Ohio, Indiana, Kentucky, Illinois, Wisconsin, Michigan, Minnesota, Iowa, Missouri, Kansas, Nebraska, South Dakota, and North Dakota. ...

Relief of the Central States, 1910
A relief of the Central States. ...

The Central States, 1910
The central States. ...

Detroit, Cleveland, Cincinnati, and Pittsburg, 1910
A map from 1910 of southern Michigan, Indiana, Ohio, and western Pennsylvania showing major cities and the railroad network, with inset maps detailing the location of Detroit, Cleveland, Cincinnati, and Pittsburg, and their relation to the trade rout...

St. Louis, Kansas City, Omaha, Minneapolis, and St. Paul, 1910
The location of St. Louis, Kansas City, Omaha, Minneapolis, and St. Paul. ...

Chicago and Milwaukee, 1910
The location of Chicago and Milwaukee. ...

Glacial Moraines in the Northern Midwest, 1911
The distribution of glacial moraines and direction of ice movement in southern Michigan and northern Ohio and Indiana. ...

Drift Sheets of Iowa and Northern Illinois, 1911
The relations of the drift sheets of Iowa and northern Illinois. 1, Kansan; 2, Illinoian; 3, Iowan; 4, Early Wisconsin; 5, Late Wisconsin; 6, Driftless area; 7, course of the Mississippi River during the Illinoian glacial epoch....

Dakota Glacial Lobe, 1911
The southern limit of the Pleistocene ice sheet and distribution of moraines of the Dakota glacial lobe, North and South Dakota....

Algonkian and Iroquois Beaches, 1911
An isobaric map of the Algonkian and Iroquois beaches, showing the broader features of warping numbers. Numbers indicate elevation of raised beaches above the sea. ...