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- [6] RELATIONSHIP BETWEEN SOIL COLOR AND ORGANIC MATTER CONTENTS AGROCHIMICA, 1968, 12 (04): : 369 - &
- [7] COLOR CHART FOR ESTIMATING POTATO CHIP COLOR CANADIAN INSTITUTE OF FOOD SCIENCE AND TECHNOLOGY JOURNAL, 1971, 4 (03): : 136 - &
- [8] Color chart: Reinventing color, 1950 to today ARTFORUM INTERNATIONAL, 2008, 46 (05): : 127 - 127