ELECTRONIC	h   t   t   p   c o l o n   s l a s h   s l a s h   w   w   w dot c   d   s   g dot o r g   s l a s h   h d c r d a t a   s l a s h   s t e v e n s x dot h   t   m	http://www.cdsg.org/hdcrdata/stevensx.htm	1