I list below all topic groups, which I have done according to subjects, which they handle. You can return to this topic group by using this menu and the link Table of topic groups on the top of the each page.
Below is a list of minimal changes of the actual contents of the pages in this sub-site (when I edit this list counting from the date of the last edited change(s) I delete normally from this list changes, which are elder than a month):
A Note. Sorry but I had no time to fix links in the link page.