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Section 785.19 (e) Continued. (ii) The proposed operations would not materially damage in the quantity and quality of water in surface and underground water systems that supply those alluvial valley floors which are-- (A) Included in clause (1)(i) of this paragraph (e); or (B) Outside the permit area of an existing or proposed surface coal mining operation. (A) Salt tolerances for agricultural crops have been published by E. V. Maas and G. J. Hoffman, in a paper titled, "Crop Salt Tolerance-Current Assessment" contained in The Journal of The Irrigation and Drainage Division, American Society of Civil Engineers, pages 115 through 134, June, 1977. Table 1, giving threshold salinity values is presented on pages 22 through 125. • (B) This publication is hereby incorporated by reference as it exists on the date of adoption of this Part. Notices of changes made to this publication will be periodically published by the Office of Surface Mining in the Federal Register. The Maas and Hoffman publication is on file and available for inspection at the OSM Central Office, U. S. Department of Interior, South Interior Building, Washington, D.C. 20240, at each OSM Regional Office and at the central office of State regula- tory authorities located west of the 100th meridian, west longitude. Copies of the publication may also be obtained by writing to the above locations. A copy of this publication will also be on file for public inspection at the Federal Register Library, 1100 L Street N. W., Washington, D.C. Incorporation by reference provisions approved by the Director of the Federal Register on February 7, 1979. The Director's approval of this incorporation by reference expires on February 7, 1980. (ii) Potential increases in the concentration of total dissolved solids . of waters supplied to an alluvial valley floor in excess of those incorporated by reference in paragraph (i) shall not be allowed unless 785-23