Downloading more than 1 file at a time

I'm new to Logos and do a lot of reading on my iPad while on the bus (no internet connection) so I'd like to download most of my library. Is there a way to download more than one book at a time? Or at least a whole series? Tapping one book at a time is taking forever. I've tried using a keyboard to cmd and shift + select to get more than one and it just opens the book. What am I missing?

Also, while I’m downloading 1 at a time, are there any particular resources / datasets I need to look for to have Factbook etc working offline? I have full v10 features.