(1955). Water: The yearbook of agriculture 1955. Washington: The United States Government Printing Office.
Παραπομπή Chicago StyleWater: The Yearbook of Agriculture 1955. Washington: The United States Government Printing Office, 1955.
Παραπομπή MLAWater: The Yearbook of Agriculture 1955. Washington: The United States Government Printing Office, 1955.
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