Não informado. (1960). Agriculture in Northern Ireland. Department of Agriculture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Agriculture in Northern Ireland. Belfast, Irlanda: Department of Agriculture, 1960.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Agriculture in Northern Ireland. Department of Agriculture, 1960.
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