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It would be great to find these manuals in electronic format, preferably PDF. But in any case, they can be converted to the format I need using https://pdfguru.com/djvu-to-pdf DjVu to PDF Converter. I prefer PDF because it is more convenient to work with, and besides conversion, this online tool also supports many other functions, including editing.
So I’d appreciate it if you could share these manuals.