The Leading Edge (née Geophysics: The Leading Edge of Exploration) will celebrate the 20th anniversary of its first issue in June. TLE's Editorial Board thought this milestone would be a good time to review the evolution of the journal itself during that time and the concomitant changes in applied geophysics (e.g., theory, instrumentation, demographics, business structure and practices). We will attempt to accomplish this goal via short monthly articles throughout the year. The current (quite ambitious and, thus, subject to change without notice) schedule is starting with this retrospective of TLE's first 20 years....

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