JEQ -- Mitchell et al. 32 (3): 789 Figure IG5

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Fig. 5. Land use in the northwestern Washington study area and associated nitrogen isotope ratios ( ${delta}$ ¹⁵N) at nine well locations and two surface water sites in the northwestern Washington study area. Nitrogen isotope ratios are proportional to the size of the well symbol. Individual well numbers are shown by the well symbols.