1911 Encyclopædia Britannica, Volume 10… (1911)
“ Immediately surrounding Fort Dodge is a rich farming country. To the E. of the city lies a gypsum bed, extending over an area of about 50 sq. m., and considered to be the most valuable in the United States; to the S. coal abounds; there are also limestone quarries and deposits of clay in the vicinity—the clay being, for the most part, obtained by mining. Fort Dodge is a market for the products of the surrounding country, and is a shipping centre of considerable importance. ”
