Annual Report of the Board of Regents of the Smithsonian InstitutionThe Institution, 1921 |
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Сторінка 421
... areas in the United States where there is a greater contrast in physical features , fauna , and flora than southern ... areas show evidence of great erosion , forming canyons ( pl . 1 ) with many natural caves in their walls . The ...
... areas in the United States where there is a greater contrast in physical features , fauna , and flora than southern ... areas show evidence of great erosion , forming canyons ( pl . 1 ) with many natural caves in their walls . The ...
Сторінка 515
... areas which are seen on the general map could be wisely reduced to cultivation at the present time , or even within the next generation . By a wise and skilful discrimination we must select those areas requiring the least expenditure ...
... areas which are seen on the general map could be wisely reduced to cultivation at the present time , or even within the next generation . By a wise and skilful discrimination we must select those areas requiring the least expenditure ...
Сторінка 519
... areas of humid land in which drainage is frequently needed and irrigation is not needed . Lands can be found in all of these States which are not swampy , but in which a high water table requires that they be drained in order to fit ...
... areas of humid land in which drainage is frequently needed and irrigation is not needed . Lands can be found in all of these States which are not swampy , but in which a high water table requires that they be drained in order to fit ...
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Bureau of American Ethnology | 17 |
Report on the United States National Museum | 25 |
EXECUTIVE COMMITTEE AND REGENTS | 100 |
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