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Contents of 1-inch Boards of Different Lengths and Widths Given in Board Feet and

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NATIONAL CONSERVATION ASSOCIATION. conservation met and organized the National Conservation Association. Dr. Charles W. Eliot, president emeritus of Harvard University, was made president. Soon afterward Dr. Eliot was made honorary president of the Association, and Mr. Gifford Pinchot became president.

The National Conservation Association, with headquarters in the Colorado Building, Washington, D. C., is the organized head of the conservation movement in the United States. The association came into existence because of an urgent need for an organization open to every man and woman who stood for conservation, and which would give them an immediate opportunity for united and effective work. The firm step wennt den on Toly

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In reply to a request for a statement as to the objects of the Association the following is made The National Conservation Association

ment of our natural resources, for the welfare of ourselves and our children, and for the rights of the plain people. The Association is bound neither by political considerations nor official connections. It is free to speak the whole truth.

"That conservation means the use of our natural resources for the benefit of us all and not merely for the profit of a few is already household knowledge. The task which the National Conservation Association hug set itself

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CLAY PRODUCTS OF THE UNITED STATES, 1907.

A pyramid of burned clay would be 4,294 feet high and represents a value of $158,942,369.

SUBDIVISIONS OF GEOLOGIC TIME AND STRATA. (Prepared Expressly for the American Almanac by Professor Willard C. Hayes, of the United States Geological Survey.)

The rocks forming the earth's crest arc divided into three classes: (a) Sedimentary, including all rocks formed by aqueous, organic, glacial and enlian agencies; (b) Igneous, including all rocks that have been solidified from a molten condition, both velcanic and plutonic; (c) Metamorphic, including altered rocks of elther sedimentary or igneous origin, in which the acquired are more prominent than the original characteristics, together with the ancient crystalline schists of uncertain origin."

The sedimentary rocks are subdivided into formations, which are groups of strata of similar composition or containing the same fossils. The formations are grouped into larger aggregates called systems, which correspond to divisions of the time scale called periods. The systems and their corresponding periods are of world-wide occurrence, and standard terms are employed throughout the world. Formations, however, are local, and cannot generally be identified in more than a single geologic province. The following standard column is applicable only to the United States. It represents the most recent usage as adopted by the United States Geological Survey.

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