Harper's Magazine, 181권Lee Foster Hartman, Frederick Lewis Allen Harper & Brothers, 1940 Important American periodical dating back to 1850. |
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... material in nature - emit negative electrons and are transformed into posi- tively charged protons . This might be- come the basis of a new method of gener- ating electricity in tremendous amounts which would not require any apparatus ...
... material in nature - emit negative electrons and are transformed into posi- tively charged protons . This might be- come the basis of a new method of gener- ating electricity in tremendous amounts which would not require any apparatus ...
404 페이지
... material is provided by pro- teins and minerals . Chemical tools are provided by min- erals and vitamins . The building materials are highly specialized . Nothing will substitute for proteins in the manufacture of certain tissues . Nor ...
... material is provided by pro- teins and minerals . Chemical tools are provided by min- erals and vitamins . The building materials are highly specialized . Nothing will substitute for proteins in the manufacture of certain tissues . Nor ...
499 페이지
... material lack , has received attention . Most of our tin comes from the Far East , some from Bolivia . whatever its origin , it all has been refined in England . With the exception of a brief period at the end of the last World War , no ...
... material lack , has received attention . Most of our tin comes from the Far East , some from Bolivia . whatever its origin , it all has been refined in England . With the exception of a brief period at the end of the last World War , no ...
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