(Polk Co., ND)  --  A Polk County woman is recovering after being airlifted from a fire for treatment of severe burns.  The Polk County Sheriff's Department says crews were called to the 200 block of Hilligoss West in Fosston yesterday.  Two apartments were engulfed in flames when firefighters arrived but they were able to rescue Robin Swanson from an upstairs apartment.  The origin and cause of the fire remains under investigation.