The JBL would not be my first choice for such reference material, but you could optimize the ebooks, so that an acceptable output results.
First; why not try the process I mentioned? Have Calibre first convert the .mobi/prc
file into a pdb file. Then convert that into an epub. Let us know if that loads, and how
it looks. (Make sure Calibre's preferences have the output format set to:
"JetBook 5-inch" )
Second; the main problem for the JB or JBL functionality for reading such reference
material is the limitations for the display of graphic material. Converting the images to
8-bit Grayscale and scaling them to fit the screen size, could make many of them quite
useful for on the go reference use. This could be relatively simple for some books, or
may require, basically re-editing the ebook's structure. The text portions are not that
much of a problem.