http://www.filedropper.com/percussion
There's a readme.txt in there.
Also, if you're planning on making more orchestral music in the future, I highly recommend EWQL Symphonic Orchestra. Because they recently released the huge Hollywood Orchestra series, Symphonic Orchestra is very cheap right now, unless you have to buy it with the Complete Composer's Collection, which would not be very cheap (still great value, though).
Samples like these just don't give you control over velocity, mic position, release times, articulations, etc.
If there's anything missing you'd like to have, let me know. I have virtually every instrument on earth.