Sequence of photographs show second eruptive pulse on July 22, 1980. Mount St. Helens, Skamania County, Washington.

Typed caption accompanying slides: Slide numbers 43 through 62 show the third eruptive pulse. This sequence was taken while moving clockwise from the west to the north siide of the mountain at a distance of 7 to 10 miles and at an elevation of 17,000 feet. The .zip file contains JPEG and TIFF versions of each color transparency. Note: Slide numbers 43 - 50 were taken at 19:01 and show the pyroclastic flow as it advances northward. Skamania County, Washington. July 22, 1980. Slide number 51 was taken at 19:02. Slide numbers 52 - 55 were taken at 19:03. Slide numbers 56 - 57 were taken at 19:04. Slide numbers 58 and 59 were taken at 19:04 and 19:05. Slide numbers 60 - 62 are views of the eruption and were taken at 19:06. Slide [...]