The book Out of Door Studies in Geography was written by author Francis Marion Fultz Here you can read free online of Out of Door Studies in Geography book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Out of Door Studies in Geography a good or bad book?
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, and Dubuque, la. These mines have been worked for about a century, and in the earlier years of their existence formed an important source of supply; but since the devel- opment of the great lead mines in Mis- souri and in Idaho and Montana, the quantity of lead produced at the Ga- lena and Dubuque mines is compara- tively small. In Minnesota there are some of the most extensive deposits of iron ore in the world, and nowhere else is it 72 Out of Door Studies in Gkography. found where it is so ...easily mined. The ore occurs in beds of many square miles in extent, and sometimes hun- dreds of feet in depth, and is so loose in structure that it is scooped up with steam shovels, like so much clay or sand, and dumped on ore cars that are run down a railway built into the open mine. The coal fields of Illinois and Iowa are very extensive, that of Illinois oc- cupying almost two-thirds of the state, and that of Iowa about one-fourth. They are extensively worked, coal be- ing one of the best paying industries of the region.
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