just how natural resource utilization relates to 

 socioeconomic processes. For example, if we are 

 managing our natural resources effectively, our eco- 

 nomic activity should be dictated by the resources 

 available. If on the other hand, we cannot identify 

 important processes or the levels of resources avail- 

 able, then economic activity is probably dictating 

 the rate of utilization. That is, are we cutting trees 

 faster than we are growing them? In any event, the 

 information contained in the conceptual model 

 and the pilot study does not clearly show the rela- 

 tionship between man's activities and the natural 

 resource base. It is hoped that during the course of 

 this project we will be able to improve our under- 

 standing of this relationship. 



Another problem that has become apparent in- 

 volves the various ecosystem models. For example, 

 the different systems vary with high and low tides, 

 night and day, summer and winter, and high and 

 low flows. We are looking over various options that 

 could be used to modify the models to show these 

 variations. 



REFERENCES 



Cutright, P. R. 1969. Lewis and Clark: Pioneering 

 naturalists. University of Illinois Press, Urbana. 

 506 pp. 



Jackson, D., ed. 1977. Letters of the Lewis and 

 Clark expedition with related documents, 

 1783-1854. University of Illinois Press, Urbana 

 (cited in Cutright, 1969). 



Lindeman, R. L. 1942. The trophic-dynamic aspect 

 of ecology. Ecology 23:399-418. 



Maclure, W. 1817. Observations on the geology 

 of the United States of America with some 

 remarks on the nature and fertility of soils by 

 the decomposition of the different classes of 

 rocks; and an application to the fertility of 

 every state in the Union in reference to accom- 

 panying geologic map. Read as a memoir 

 before the Am. PhUos. Soc. and inserted in the 

 first volume of their Transactions, New Series- 

 Philadelphia. 



Oregon Division of State Lands. 1973. Oregon 

 estuaries, Portland, Oregon, n.p. 



Thwaites, R. G., ed. 1904-5. Original journals of 

 the Lewis and Clark expedition. Dodd, Mead 

 and.Co. New York. 8 vols (cited in Cutright, 

 1969). 



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