trict in the Ruhr Basin is largely dependent on the
Lorraine iron ore, and the movement of this iron ore requires coal from
down the Rhine as a balance.

The intelligent handling of this great coal and iron problem is of
far-reaching consequence to the mineral industries of the world.

CONCLUSION

In the foregoing discussion it is not our purpose to argue for any
specific national or international plan or procedure, but rather to show
something of the nature of the problem,--and particularly to show that
intelligent and broadened self-interest requires a definite national
policy in regard to world mineral questions. Realization of this fact is
a long step toward the solution of the international problems. No
geologist, engineer, or business man is safe, in the normal conduct of
his affairs, without some attention to these matters.

It is our purpose further to bring home the fact that international
cooperation in the mineral field is not merely an academic possibility,
but that in many important ways it is actually in existence. The terms
of the Peace Treaty alone have far-reaching consequences to the explorer
or mining man in all parts of the world. The modifications of these
terms, which are inevitable in the future, will not be of less
consequence. It is necessary not only to know what these are, but to aid
in their intelligent formulation.

LITERATURE

A vast new literature on the subject of international mineral relations
has sprung into existence during and following the war, and anyone may
easily familiarize himself with the essentials of the situation. Some of
the international features are noted in the discussion of mineral
resources in this book. For fuller discussion, the reader is especially
referred to the following sources:

The reports of the United States Geological Survey. Note especially
_World Atlas of Commercial Geology_, 1921.

The reports of the United States Bureau of Mines.

_Political and commercial geology_, edited by J. E. Spurr, McGraw-Hill
Book Co., New York, 1920.

_Strategy of minerals_, edited by George Otis Smith, D. Appleton and
Co., New York, 1919.

_Coal, iron and war_, by E. C. Eckel, Henry Holt and Company, New York,
1920.

_The iron and associated industries of Lorraine, the Sarre district,
Luxemburg, and Belgium_, by Alfred H. Brooks and Morris F. LaCroix,
Bull. 703 U. S. Geological Survey, 1920.

_The Lorraine iron field and the war_, by Alfred H. Brooks, Eng