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Chapman’s 1917 book, “The Distribution of Bird-Life in Colombia,” has been an especially important reference for the country’s ornithologists, virtually all of whom have participated in the resurvey project in some form or another.

It said an investigation was carried out and additional work to "resurvey trees" by key enclosures was under way.

Another challenge to cleanup efforts is the weather, with officials stating that crews have to sometimes resurvey sites to ensure that a hurricane did not push munitions into a previously cleared site.

Williams said the school system plans to resurvey families about their learning preferences — hybrid or remote — in November.

But we are pretending that we need to resurvey them because, who knows, maybe they got stronger in the past 25 years.’’