Can't locate USB Keyboard LIbrary

This seems so simple I must be missing something...

I am using the USB keyboard libraries (see or

I need to include them (#include whatever_the keyboard_library_name_is) but I am not sure where is is located.

Sketch -> Import Library doesn't list them. And when you Google "Arduino keyboard Library download" no zip file is to be found?

Surely I can't be the first on this. Any help would be appreciated.