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| 110 |
_a _aUnited States National Resources Committee |
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| 245 | _a Problems of a changing population | ||
| 260 |
_a _b _aWashington _bGPO _cUS |
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| 260 |
_c _a1938 |
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| 300 |
_a _a306p. |
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| 041 | _a <En> | ||
| 082 | _a 312.073/US | ||
| 650 | _a <Demography><United States> | ||
| 999 |
_c23707 _d23707 |
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