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This report considers the biological and behavioral mechanisms that may underlie the pathogenicity of tobacco smoke. Many Surgeon General's reports have considered research findings on mechanisms in assessing the biological plausibility of associations observed in epidemiologic studies. Mechanisms of disease are important because they may provide plausibility, which is one of the guideline criteria for assessing evidence on causation. This report specifically reviews the evidence on the potential mechanisms by which smoking causes diseases and considers whether a mechanism is likely to be operative in the production of human disease by tobacco smoke. This evidence is relevant to understanding how smoking causes disease, to identifying those who may be particularly susceptible, and to assessing the potential risks of tobacco products.
Examining how the Wengers have cautiously and incrementally adapted to the changes swirling around them, this book offers an invaluable case study of a traditional group caught in the throes of a postmodern world."--Jacket.
"This bulletin has been prepared with two purposes in view : First, to outline the conditions which must be considered before attempting to make denatured alcohol, and second, to give in detail the practical methods for the manufacture of alcohol from potatoes. A discussion of general conditions is given in order to answer the many inquiries received at the Department as to the availability of various materials and it is hoped that persons interested, by a careful reading of this section, will be able to decide for themselves as to the value of any proposed material and the possibility of successfully making alcohol from it under their respective local conditions"--Purpose of the bulletin (p.5)
Since precolonial times, agriculture has been deeply woven into the fabric of Pennsylvania's history and culture. Pennsylvania Farming presents the first history of Pennsylvania agriculture in more than sixty years, and offers a completely new perspective. Sally McMurry goes beyond a strictly economic approach and considers the diverse forces that helped shape the farming landscape, from physical factors to cultural repertoires to labor systems. Above all, the people who created and worked on Pennsylvania's farms are placed at the center of attention. More than 150 photographs inform the interpretation, which offers a sweeping look at the evolution of Pennsylvania's agricultural landscapes right up to the present day.