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It turns out i had put a small s in the links in
https://forum.loohan.com/viewtopic.php?id=887
and the folder name has a large S. Or maybe at some time i changed the case of the S in the folder. Anyway, many of the direct links to its contents did not work sometimes. I have fixed the links. I think. Let me know if anyone stumbles across any of the links which do not work.
Even the subfolder directory is accessible now:
https://loohan.com/Symbol_PDFs/
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