FEDERAL RESEARCH AND DEVELOPMENT EXPENDITURE IN THE UNITED-STATES

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NATURE | 1958年 / 181卷 / 4608期

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O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

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07 ; 0710 ; 09 ;

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页码：534 / 535

页数：2

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