From, you guessed it...Old Stone Blast Furnaces of Western Pa...Pine Creek furnace built in 1845 to makehot blast charcol iron....a pile of rubble now. In 1966 the stone abutment at the end of the charging bride was still estant. Lots of slag, both charcoal and coke. I'll spare everyone the directions, since other members of this list have incuded them. This book lists fifteen furnace sites in Armstrong. I will be happy to list them if other members of the list would like me too. Happy New Year to all. Mimi Reed, State College, PA.