Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska ecologicalinvest00brow Year: 1975 Fig. 6a. Pingo, 6September 1971. ' aI-JSa^ Fig. 6b. Pingo, 14 April 1972. *The density ranges are only approximate and indicate the differences one may expect between these snow types.

---

Size: 998px × 2004px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage