Ngày tải lên: 02/12/2016, 12:31
Project Gutenberg''''s The Chemistry of Hat Manufacturing, by Watson Smith pptx
... depends the distinction of the value of many classes of wool and fur These scales vary both as to nature and arrangement in the case of the hairs of different animals, so that by the aid of the microscope ... under the microscope, and now we see the reason of the saw-like edge in the longitudinal section, for just as the tiles lie on the roof of a hou...
Ngày tải lên: 28/06/2014, 19:20