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Episodes 2022; 45(2): 221-221

Published online June 1, 2022

Copyright © International Union of Geological Sciences.

Professor Dr. Gerard V. Middleton (1931-2021)

Jhonny E. Casas

AAPG Education Director

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.