easy way to join all adjacent surfaces?

if i have a bunch of surfaces that form a polyhedron, i can select them all in rhino and join them into a single polysurface.

if i have a bunch of these polyhedrons all in close proximity (but not touching), is there a way to easily get all the surfaces of each polyhedron to join? or do i have to do one polyhedron at a time and select each surface and join?

thanks!