“This repeat photo pair represents a fortuitous pairing. When I took the 2004 photo I didn’t know of the 1929 photo. The location of the airplane in each photo doesn’t match too well (the 2004 was taken from a higher altitude), but is quite good given the unplanned nature of the repeat photo. Recession and surface lowering are apparent. The great quantity of icebergs in the 1929 image indicates that in the late-1920s West and East Twin glaciers were losing a great deal of mass through calving into Twin Glacier Lake.” — Matt Beedle
The 1929 photo is used here with permission from the Alaska State Library.