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report discusses their hybridization in nature <br />and in the laboratory. Crosses have been made <br />between these two species and inter- and intra- <br />populational crosses within each at it appears <br />that the interspecific hybrids are as successful <br />and as fertile as any others.- Therefore, there <br />appears to be no genetic barrier to interbreeding <br />between these two species, at least between the <br />populations studies. <br />188. Hynes, H. B. N. 1970. The ecology of running <br />water. University of Toronto Press. 555 <br />PP• <br />This book provides a comprehensive and critical <br />review of the literature on the biology of <br />rivers and streams. Water flow, vegetation, <br />invertebrates, fishes and ecosystems of running <br />water are discussed in some detail. <br />189. Iorns, W. V., C. H. Hembree, and G. L. Oakland. <br />1965. Water resources of the upper Colorado <br />River basin--technical report. U. S. <br />Geological Survey Prof essional Papers No. <br />441. 370 pp. <br />An appraisal of water flow, chemical quality <br />and utilization in the upper Colorado River <br />basin is presented. The basin is divided into <br />the Grand division (Upper Colorado), Green <br />division, and San Juan division. Acreage <br />allotments to 1964 (according to the U. S. <br />Bureau of Census) for irrigation, as well as <br />domestic uses, transbasin removal, and reservoir <br />storage use are given for each division and <br />each subbasin. Figures on precipitation and <br />flow duration are also presented. <br />190. Iorns, W. V., C. H. Hembree, D. A. Phoenix, <br />G. L. Oakland. 1964. Water resources <br />the upper Colorado River basin--Basic <br />Data. U. S. Geological Survey Profess <br />Papers No. 442. 1034 pp. (Abstr.) <br />FLOW <br />VEGETATION <br />INVERTEBRATES <br />MOVEMENTS <br />ECOLOGY <br />FISH <br />FOOD HABITS <br />PLANKTON <br />WATER DIV. <br />WATER QUAL. <br />FLOW <br />AGRICULTURE <br />GREEN R. <br />SAN JUAN R. <br />COLORADO R. <br />and FLOW <br />of WATER QUAL. <br />SEDIMENT <br />Tonal HISTORY <br />HYDROLOGY <br />COLORADO R. <br />This is the basic data section of a report by <br />the U. S. Geolgical Survey on the water resources <br />of the upper Colorado River basin. This section <br />contains tables of duration of water discharge <br />8D <br />