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Show Record At Greenriver and Cisco we have been getting daily water 3799 samples from August 1st, 1928, to the present time. During this entire period we have had something like 5000 silt samples and about 3500 water samples. That outlines the work of the geological survey in the last four years. Based on that data and my study of these streams I did prepare some reports. In 1927, a paper was put out by Mr. Collins, 3800 Chief of the Quality of Water Division, and myself, on the quality of the water in the Colorado River in 1925 and 1926. This paper, Water Supply Paper No. 596- B, contains the result of our first year's work on the dissolved material and the amount of suspended matter found in these samples. Report 596- B does not deal with any part of the river North of Lees Ferry. In July, 1928, Mr. Collins and I had an article in the magazine " Architectural Engineering & Industrial Chemistry", entitled " Dissolved and Suspended Mineral Matter in the Colorado River." That article contains the results that are in number 506- B and a summary of our determinations on the suspended matter at Bright Angel and Topock, and nothing above. Complainant's Exhibit No. 492, being a pamphlet, entitled " Architectural Engineering and Industrial Chemistry", containing article by W. D. Collins and C. S. Howard, July, 1928, on " Dissolved and Suspended Mineral Matter in the Colorado River", was received in evidence. Attention is called particularly to Table 3 on page 7 3801 of Exhibit 492. We have data for Grand Canyon and Lees Ferry for a little over a year, and that data seems to indicate that the quantity at Lees Ferry is about the same as at Grand Canyon. There are occasions when the Little Colorado increases the load a little bit, but the flow is about the same and the suspended mater is about the same. Then I have Water Supply Paper No. 636- A, " Quality of Water in the Colorado River in 1926 to 1928." In this paper we give |