Economic and Environmental Geology

Fig. 2.

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Fig. 2. Generational evolution in telecommunication technology. Minor modifications to legend from Interagency association (2021a).
Econ. Environ. Geol. 2021;54:659-70 https://doi.org/10.9719/EEG.2021.54.6.659
© 2021 Econ. Environ. Geol.