Theodor Weyl eBooks
eBooks di Theodor Weyl di Formato Pdf
The Coal-Tar Colors: With Especial Reference to Their Injurious Qualities and the Restriction of Their Use. E-book. Formato PDF
Theodor Weyl
edizioni Forgotten Books collana , 2017
For the more accurate and satisfactory representation, I have had engraved a hexagon matrix, types cast from which have been used in the ring symbols. It will be a source of gratification to the practical sanitarian to note the comparatively small proportion of really injurious colors, for even with some of those which...