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Standard samples issued or in preparation by the National Bureau of Standards.

APA Citation

(1935). Standard samples issued or in preparation by the National Bureau of Standards. Washington, DC: U.S. Gov. Print. Off..

Standard Samples Issued Or In Preparation by the National Bureau of Standards. Washington, DC: U.S. Gov. Print. Off., 1935.

Warning: These citations may not always be complete (especially for serials).