position where the opening is closed; moving the sliding lid slightly rearward; lowering a front end of the sliding lid a predetermined distance after the front end is moved slightly rearward away from a front edge of the opening; moving rearward the sliding lid until the sliding lid reaches a fully opened position; and moving the sliding lid following the steps in a reverse fashion when closing the sliding lid.Glacier, Glacier Park (USGS Photo Library)

The Boulder Glacier photos show the glacier disappeared during the 56-year interval between photographs. The photos below show that a landscape dominated by sagebrush in 1869 became weed-dominated during the 140 year interval between photographs. Sagebrush covered the slope beyond the train in 1869. No sagebrush is visible there today. I also repeated this photo in 1978. At that time, about half the sagebrush was gone.

Russell 1869

Big Trestle photographed by AJ Russell in 1869 and repeated by Garry Rogers in 2009.

The photos below were taken on an almost inaccessible ridge that has never been grazed by livestock. From the 1916 photo by Homer Shantz, to the 1976 photo by me, there was almost no change. Look closely at the foreground. You can see