Classification of meteorological calamity degree for three crops and division of calamity loss rate in Hebei Province Population Dynamics of the Golden Pheasant (Chrysolophus pictus) in the Three Gorges Reservoir Area after the Snow Calamity in 2008 The Anti-Fertility Effect of Extract Chloroform from Neem Oil on Male Mice Research of agricultural drought-fight and calamity-diminished technology in the Loess Plateau Gully Region Investigation on the occurrence of extraordinarily serious sand storm in Ningxia Hui Nationality and Nei Monggol Autonomous Regions