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The first file on the tape is the coding manual. The manual contains the formats for the data sets, the set of nutrient numbers used in the full version of the file, the key to abbreviations used, the codes needed to identify the foods used in the data file and the weights used for the two household measures reported in the publications. The formats are contained in the file for all versions of the standard reference data sets being distributed although only one is appropriate for a given data set. The second is made up from the most recent data base of food composition data. Values for twenty-one composition items are included, which are: Moisture, food energy, protein, fat, carbohydrate, fiber, ash, calcium, phosphorus, iron, sodium, potassium, vitamin A, thiamin, riboflavin, niacin, ascorbic acid, saturated fatty acid, oleic acid, linoleic acid and cholesterol. The third file on the tape is for linking the codes used in the 1963 Agriculture Handbook No. 8 (AH-8) to the one used in the updated sections of AH-8 and to identify food codes to be dropped from the current release of the data set.