Tác giả: Webb Robert H. Webb

In 1923, America paid close attention, via special radio broadcasts, newspaper headlines, and cover stories in popular magazines, as a government party descended the Colorado to survey Grand Canyon. …

The Colorado River and its deeply entrenched canyons create a lengthy barrier to travel in the interior West. Here and there, ancient Indian foot trails descend canyon walls and find access to the ri …

First developed in the 1880s as a way to monitor glaciers in Europe, repeat photography -the practice of taking photographs at different points in times from the same physical vantage point-remains a …

In prehistoric times, the Santa Cruz River in what is now southern Arizona saw many ebbs, flows, and floods. It flowed on the surface, meandered across the floodplain, and occasionally carved deep ch …

No one in America would deny that the weather has changed drastically in our lifetime. We read about El Nino and La Nina, but how many of us really understand the big picture beyond our own front win …

The Changing Mile, originally published in 1965, was a benchmark in ecological studies, demonstrating the prevalence of change in a seemingly changeless place. Photographs made throughout the Sonoran …

Photographs made in Grand Canyon a century ago may provide us today with a sense of history; photographs made a century later from the same vantage points give us a more precise picture of change in …