In this, his most important work, Ramazzini discusses over 50 occupations, wrestlers, farmers, nurses, soldiers, as well as miners, potters, stonemasons and others already mentioned. A highly versatile scholar, he also "wrote on such subjects as the water supply of Modena, cattle plague, personal hygiene, and the abuse of cinchona ... in discussing the etiology, treatment, and prevention of these [occupational] diseases he often goes back to Hippocrates, Celsus, and Galen, and, after summarising their observations, relates his own experiences with the various diseases" [Heirs of Hippocrates]