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Lua i Stíl Chicago (17ú heag.)United States. Department of Agriculture. Abstracts of Recent Published Material on Soil and Water Conservation. Washington, D.C.: United States Department of Agriculture, 1956.
Lua MLA (9ú heag.)United States. Department of Agriculture. Abstracts of Recent Published Material on Soil and Water Conservation. United States Department of Agriculture, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.