/as/gmbbasics2.htm not found
Since rebuilding this site I note that some earlier or unfinished pages have crept in and been picked up by search engines.
Try the contents page for better versions!
Another note: Filenames for most files on this site end .html, not.htm. Try adding an extra l
Sometimes I see (dodgey links use) filenames that are all lowercase: some directories are inaccessible, e.g. A15, A17 But filenames may start with a capital.
I have also seen filenames with odd additions: Some linkers have added full stops (.) or slashes (/), or other strings of characters.
Just edit these out of the URL field in your browser and try again!