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spec: The course addresses state of the art methodologies for investigating the environmental contribution to geographical variations in cancer incidence and cancer risks related to low level widespread carcinogen exposures , including the role of biomarkers and molecular epidemiology . In the House , there are 3 types of record votes : a Recorded Vote , the Yeas and Nays , and an automatic Roll Call . Raitz and Brunn tied the development of farm journals to geographical variations and the growing dominance agriculturally of those regions . Army Lt. Frank Luke shoots down his first enemy observation balloon . The mean speed of sound between a given position & a listening station may vary in a range between 1470 and 1510 m / s , due to geographical variations in the sound speed profiles & ray geometry . More deaths could be attributed to geographical variations in mortality rates . The sophomore was wearing a boot to protect the ankle - - injured late in the third quarter - - after the game . Path analysis allows predictions of population behaviour in relation to geographical variations .