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2 the usefulness of this reference. We therefore included references that would have a direct or indirect effect on the river environment and consequently on the aquatic organisms that inhabit the river. References on the ecology and life history of fish and macroinvertebrates from the lower basin or other waters were included to add to the understanding of these organisms in the upper basin. Other references were included that do not deal specifically with the upper Colorado River, but that may be valuable for interpretation. For reports that are published annually, such as the U.S. Geological Survey water supply and aquatic records, only the latest volume was cited, together with the beginning date of the series. Selected key words were assigned to all references and are indexed for convenience and ease in locating the literature on particular subjects. Although most of the key words are standard descriptive terms, several should be clarified for this bibliography. AGE-GROWTH refers to the age, growth, and length-weight relations of fish. ALLOCATION concerns the designation or plan of dis- tributing natural resources, particularly water. ALTERATION applies to man-made changes of terres- trial or aquatic ecosystems. FISH-rare pertains to fish species that are few in number and that may bec1a~sified as threatened, endangered, or unique. MIGRATION refers to directed movement (usua11y.seasona1) of animals into or from a specific area. MOVEMENT applies to a small change in location or position by an animal as compared with a longer directed movement that would be consid- ered a migration. We hope that this bibliography will be helpful to commissions, institutions, and state and federal agencies that will be involved in future decisions concerning the management of the aquatic resources of the Upper Colorado River Basin. Although this bibliography contains 1,109 published or readily available unpublished references, the constraints of time and space have dictated that it not be all-inclusive. We believe, however, that the compilation will provide, at a minimum, a useful starting place for anyone who has an interest in the Upper Colorado 'River Basin. ACKNOWLEDGMENTS The work reported in this paper was supported by the U.S. Fish and Wildlife Service, Contract No. 14-16~0008-1140 and the Colorado River Fishes Recovery Team. Many people at various university, state, and federal libraries or offices assisted us in locating references. Marion Hershcopf, Colorado Division of Wildlife, Fort Collins, was particularly helpful in the search of the litera- ture. The publication costs were paid by the Office of Endangered Species, U.S. Fish and Wildlife Service, Washington, D.C. C. Banks prepared the drawing for tbe front cover.