The images were taken from:

Dictionary -- Mattahan (Paul Davey) 
http://www.iconarchive.com/icons/mattahan/buuf/Dictionary-128x128.png

Folder -- Laurent Baumann
http://www.iconarchive.com/icons/laurent-baumann/aqua-blend/Folder-Generic-128x128.png

Both are available under a Creative Commons Attribution-Noncommercial-Share Alike license.