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,. 4 N ClO 00 00, led to considerable confusion. It is also proposed that the five categories of sediment yield be given written characterizations that will allow for consistent written accounts of the severity of sediment yield categories. The proposed written classifications are as.follows:' Old Class 1 2 3 4 5 New Class ,5 4 3 2 1 Range (ac-ft/sq mil > 3.0 1.0-3.0 0.5-1.0 0.2-0.5 < 0.2 Description very High High . Moderately High Moderate Low It is recommended that the point rating b.e eliminated, fromt.he above classification scheme because in the original PSIAC there is a discrepancy between the 75 point class limit and the assigned sediment yield value of 1. 0 acre-feet/square mile (75 points is equal to 1.225 acre-feet/square mile). The use of acre-feet. for the development of classification is adequate for rating purposes. Modification 7: It is recommended that the section of the PSIAC, 1968 report referred to on the title page as "Selection and Evaluation of Measures for Reduction of Erosion and Sediment Yield in the Pacific Southwest" be eliminated. The elimination of this major section of the report is necessary because the rapidity with which the field of conservation land treatment is changing. The 1968 section is out of date and if a new section were proposed, it too would become out of date in a very short time. It is recommended that a conservation land treatment reference section be added to the report at the end of the sediment yield procedure section. This new section would refer the user to the annually updated planning manuals and technical guides of the following agencies: (1) US Department of Agriculture, Soil conservation Service, various conservation planning handbooks and manuals; (2) US Department of Agriculture, Forest Service, varioUs con.servation planning procedures and documents; (3) US Department of Interior, Bureau of Land Management, various conservation planning handbooks and manuals; (4) Cooperative Extension Service, an organization in every state funded by state and federal money, various conservation planning handbooks and manuals. The BLUE PAGES in telephone directories will have addresses and telephone numbers of state and field offices of the abovementioned agencies. The handbooks, manuals and other references or guides can be obtained through the Freedom of Information Act for a reproduction fee (or free for a small number of pages) by contacting state or national offices of the above agencies. Modification 8: It is proposed that the PSIAC rating factor Geology (a) is given too much weight in the rating system (ten points) and that this rating factor be given a rating maximum of