Inside Kenyon Hall, Emporia, Kansas – Underneath the heart of (what was once) a pipe organ’s sound generating instruments is a nest of wooden reed pipes which, unless I’m mistaken, provided the bass. The organ itself is long gone, but wooden and brass pipes of all sizes are still in place.
These are Wooden Bourdon pipes. They're not reed pipes. Every pipe organ has at least one of these ranks. They are the single most common pedal rank, but are also used at other pitches as well.