Coal Fields of the United States, 1916
A map from 1916 of the United States showing the known and undeveloped coal fields at the time. The map is keyed to show the workable coal beds, areas that may contain coal, and coal beds located under heavy cover or overburden....

Petroleum and Natural Gas Fields, 1916
A map from 1916 of the United States showing the petroleum and natural gas fields known at the time. The map is keyed to distinguish the petroleum reserves from the natural gas reserves....

Distribution of Iron Ore in the Northeast, 1916
The distribution of iron ore from the Lake Superior district. ...

Metal and Mining , 1916
The metal production and mining regions of the United States in 1916. ...

Production of Coal in the United States, 1918
"Production of coal in the United States in 1918 and outlines [in red] of coal fields... Size of block is proportional to percentage of total production of the United States in 1918; percentage indicated also by figures... Approximate outlines o...

Production of Mercury, Arsenic, and Bauxite in the United States, 1918
"Production of mercury, arsenic, and bauxite (aluminum ore) in the United States in 1918 ...Size of block is proportional to percentage of total production of the United States; percentage indicated also by figures. A cross represents less than ...