Economic and Environmental Geology

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Fig. 5.

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Fig. 5. Time series evolution of (a) classic topics and (b) emerging topics. Turn point, 1994 (dashed grey vertical line), serves as the dividing year between the two time periods.
Econ. Environ. Geol. 2021;54:353-64 https://doi.org/10.9719/EEG.2021.54.3.353
© 2021 Econ. Environ. Geol.