| 21. | One of Monaco's main sources of income is tourism.
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| 22. | One source of income for the area is visiting cruise ships.
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| 23. | Shipping and hydroelectricity were important sources of income for the country.
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| 24. | Agriculture has always been a major source of income in Putten.
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| 25. | Tourism is a major source of income for the entire area.
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| 26. | Tourism has in recent decades become a vital source of income.
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| 27. | The main source of income, however, was herring fishing.
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| 28. | Agriculture, forestry and fishery are other important sources of income.
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| 29. | This subsidy is an essential source of income for the counties.
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| 30. | Pearl farming provides a major source of income for the islands.
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