Which guidebooks are available as ebooks?

I've seen a Trekstor ebook reader and was wondering which guidebooks are available as ebooks. I think this reader takes all standard ebook formats.

all the lonely planets can be downloaded in pdf format which most readers can display.

in my opinion pdf for small ereader...are not up to reading!
few guidebooks are available in azw, try amazon.

#2, maybe, but its easy to convert, many free convertors around. the problem with guidebooks is you want the maps.

#3...just in my experience..i use kindle..and looking into the map..it's a pain..

some pdf are from scan..not text..so it's not easy read it.
i don't understand why lp..doesn't sell guide in epub format.