DescriptionNiobium rod.jpg English: A niobium cylinder Date 19 October 2005 Source http://woelen.homescience.net/science/index.html Author W. Oelen...
This file has an extracted image: Marbled paper - from, Radio-active substances (page 1 crop).jpg....
DescriptionNiobium2nb.jpg English: Niobium rod and sheets Date 2 March 2006 Source http://woelen.homescience.net/science/index.html Author W. Oelen...
