IN reply to Mr. Simeon's communication published in NATURE of November 21, we would state that of the many different types of Zeiss Abbe refractometer, including a late pre-war instrument, that have ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Warren P. Valentine began making ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results