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A total of 549 standard samples is available for the spectrochemical analysis of aluminum and its alloys; in addition, 122 standards are reported in the preparation stage. Only four primary standards are available, and these are in the form of disks issued by the National Bureau of Standards. The remainder are secondary standards and consist of 201 disk samples from the Aluminum Company of America; 97 disk and rod samples from the Apex Smelting Co.; 99 rod samples from the Aluminium Laboratories Limited; 26 disk samples from Morris P. Kirk and Son, Inc.; 22 rod samples from Johnson, Matthey and Co., Ltd.; 5 chip samples from the Bureau of Analysed Samples, Ltd.; and 2 chip samples from the National Bureau of Standards.