Re those questions in the previous pages on the formats that the PB can read .... I change all my ebooks formats to EPub via Calibre, which I use as my 'Library' so to speak.
The travel book question mentioned shouldn't be a prob to read if you use Calibre to change it to EPub, if it isn't already in that format.
Of course, I use various programs to free up my ebooks in order to load into Calibre.