Agricultural Gazette of N.S.W., Aiigust 2, 1920. 



D3 



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Litmus Lactose Agar Plate, atmospheric exposure for 2i minutes in the 



attemperator room of a modern factory. [Original.! 



Agar Plate, atmospheric exposure for 2A minutes in the cheese-making 



room of a modern factory. |Origin:il.| 



