Minerals ...

Products of the soil

The Home and School Reference Work: And Perpetual Pictured Loose Leaf Extension ; the Work of More Than Two Hundred of the World's Foremost Educators, Volume 2

The Home and School Reference Work: Volume 7

Geography of Commerce and Industry

The Home and School Reference Work: Volume 6

The Geography of Commerce and Industry

The Home and School Reference Work: Volume 5

The Source Book: An International Encyclopedic Authority Written from the New World Viewpoint, Volume 4

The Home and School Reference Work: And Perpetual Pictured Loose Leaf Extension ; the Work of More Than Two Hundred of the World's Foremost Educators, Volume 7

The Source Book: An International Encyclopedic Authority Written from the New World Viewpoint, Volume 6

Transportation ...

The Source Book: An International Encyclopedic Authority Written from the New World Viewpoint, Volume 5

Great American Industries: Coal, petroleum, iron, marble, slate, gold, and silver, copper and zinc

Great American Industries; Volume One: Coal, Petroleum, Iron, Marble, Slate, Gold and Silver, Copper and Zinc, Volume 1

The Source Book: An International Encyclopedic Authority Written from the New World Viewpoint, Volume 3

Great American Industries Series: Minerals

The Home and School Reference Work: Volume 4

Great American Industries: Minerals. First book, Volume 1

The Home and School Reference Work: Volume 2