Yes, everything is still there - all my books, apps and other data. Just like it was before the problem occurred. Obviously I have no way of knowing if everybody with the same problem would get the same result since I don't know exactly what caused the problem in the first place but it certainly worked for me and I suspect would probably work for other folks with the same problem.
On a somewhat different issue - I am stunned at just how small a microSD card is. I bought my first computer, an Apple II around 1979. It cost around $4,000, had no hard drive and came with two external floppy drives which took 5.25 inch floppy drives. Each floppy disk held about 125 KB of data so I figure it would take around 125,000 of those floppy disks to equal the capacity of this teeny microSD card!