It is said that one image is worth a thousand words. But a comparison between two images seems to worth more than just two thousand words. The US Geological Survey researchers went to photograph the US glaciers from the same direction as they were photographed in the first decades of 20th century. Here there are a few examples (if there's any doubt the left image is the oldest).
| Boulder Glacier |
| 1932, photograph by George Grant (Glacier National Park Archives) | 2005, photograph by Greg Pederson (USGS) |
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| Chaney Glacier |
| 1911, photograph by M. R. Campbell (USGS) | 2005, photograph by Blase Reardon (USGS) |
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| Grinnell Glacier |
| 1940, unknown photographer (Glacier National Park Archives) | 2004, photograph by Karen Holzer (USGS) |
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| Shepard Glacier |
| 1913, photograph by W. C. Alden (Glacier National Park Archives) | 2005, photograph by Blase Reardon (USGS) |
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| Swiftcurrent Glacier |
| 1900, photograph by F. E. Matthes (Glacier National Park Archives) | 1998, photograph by Karen Holzer (USGS) |
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