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For a discussion of advantages and precautions for using the Munsell notation in this regard, see p. 17, also footnote on same page, of Technical Bulletin No. 154, U.S.D.A., A Method for Determining the Color of Agricultural Products
Colorimeter for use with disc mixture set up for measuring a 12 inch diameter area of hay.
Diagram of the side view of colorimeter illustrated in Fig. 1.