Summary and analysis of international travel to/from the United States calendar year 1978 and historical series from 1970
| Erakunde egilea: | |
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| Formatua: | Liburua |
| Hizkuntza: | English |
| Argitaratua: |
Washington, D.C.
U.S. Dept. of Commerce, U.S. Travel Service
1979.
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| Gaiak: |