These items do not fit into any specific collection of John's. I have added them here for information, interest or just because I want them to be available and not lost to posterity.
Hopefully, they might be useful to someone.
Administration
John collected together and saved as bookmarks links to the various websites he used to gather information on his interests. Unfortunately, a lot of these no longer work now, overtaken by the passage of time.
A master list by number of John's entire slide collection.
Hopefully, they might be useful to someone.