| |
| | Untitled |
 | | The revival of polar exploration began in about 1925 and was based on new tools such as the airplane, which enabled explorers to avoid the obstacles of surface travel and to cover a large area in a short period of time. |
 | | Lars Christenson, a Norwegian whaling magnate, promoted Norwegian expeditions in 1930 to 1931 and 1936 to 1937; during the latter, aerial mapping was done of an area from 20øE to 82øE, resulting in eleven sheets at 1:250,000-scale and one at 1:500,000-scale, published in Oslo in 1946. |
 | | By the end of 1961, large areas of the continent had been photographed from the air, and reconnaissance mapping - largely a matter of plotting accurately portions of the outcropping rock features or special large ice features such as glaciers - was available for major features. |
| www.library.ucsb.edu /people/larsgaard/antarev.html (4260 words) |
|