They are found on floors 24, 35, 48, 52, 68, 71, 87, 99, 106, 118, 124, 135, 142, 153, 162, 178, 185, and 197.
If you ever need any more help, just go here: http://www.fogu.com/hm6/search/index.php and then type in what you're looking for in the search bar.
~Carly
