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  1. Obtained from Difco Labs, Detroit, Michigan, and specified to be microbiologically standardized.
  2. Available from Amersil Quartz Division, Engelhard Industries, Inc., Hillside, New Jersey.

Other (2)

Obtained from Difco Labs, Detroit, Michigan, and specified to be microbiologically standardized.

Available from Amersil Quartz Division, Engelhard Industries, Inc., Hillside, New Jersey.

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