Here is the rest of the article on the APS website. I had to split it up into 2 posts because of size.
Page 6
Page 7
For anyone who was not able to use the APS link, I hope these 2 postings will help.
Dave Gill
1. Be kind and courteous to others and their views.
2. No spam, solicitations, advertising, or phishing.
3. This site is all about RILP, other subjects may be deleted.
4. Be inquisitive, curious, ready to learn, and enjoy.
Let's start a chat about these famous triangle shaped stamps