So, you’re wondering. Is the MS-DOS Encyclopedia available as an Ebook? Oh, now that’s a trick question. The MS-DOS Encyclopedia is available online, but not as an official Ebook. There are some plain text files corresponding to what you would have originally seen were you to download it and read it on your own MS-DOS computer.
20190219/DuckDuckGo The MS-DOS Encyclopedia
20190219/https://www.pcjs.org/pubs/pc/reference/microsoft/mspl13/msdos/encyclopedia/
Interestingly, one of the early versions of the MS-DOS Encyclopedia inadvertently revealed some Microsoft __ information, so it had to be recalled from the shelves. This happened even though the MS-DOS programmers reviewed the book before publication.
20190219/https://blogs.msdn.microsoft.com/larryosterman/2004/06/14/does-anyone-remember-the-original-ms-dos-encyclopedia/