There very well might be a reason why someone would want to learn DOS. The information in this book is readily available without having to make space in the crowded computer section for this ancient book. A small/medium sized public library’s computer section reveals the library’s relevancy, so effort should be made to keep it up to date.
I just love the cover, though. It definitely looks like computer clip art from 1985! Gotta love the $5 price tag.