Berlin Blockade continent for weeks. All too often, aircraft would make the entire flight and then be unable to land in Berlin. On 20 November 1948, 42 aircraft departed for Berlin, but only one landed there. At one point, the city had only a week's supply of coal left. However, the weather eventually improved, and more than 171,000 tons were delivered in January 1949, 152,000 tons in February, and 196,223 tons in March. By April 1949, airlift operations were running smoothly and Tunner wanted to shake up his command to discourage complacency. He believed in the spirit of competition between units and,
History of coal mining higher rations of food. Output doubled and the share of the region in the total national coal production rose from 8% to 22%. In 1989-91 militant coal miners in Russia and Ukraine were the mainstay of the revolutionary forced which finally overthrew the Communist system in 1991. Today the Donets Basin is the major coal-mining district in eastern Ukraine and adjacent portions of Russia. Production during 2009 was 68.7 million tons in the Ukrainian and 4.9million tons in the Russian part of the basin, but coal gas is a major hazard. The coal industry in China goes back many centuries.