When the Murrah Building was blown up in Oklahoma City - Harry Everhart was on the scene and a survivor. The building was blown up by a U-Haul Truck full of ammonium nitrate and fuel oil. Ammonium nitrate is a harmless fertilizer used on the farms of Pennsylvania to raise crops. But when mixed with common fuel oil or diesel fuel - it becomes a deadly explosive and is used in the mines of Pennsylvania to remove overburden rock.
Harry Everhart in 1974 - then a science teacher in the public schools of Pennsylvania - wrote a story in a weekly newspaper concerning the dangers of an ammonium nitrate silo near the mining towns where he lived and taught - Tamaqua, Coaldale and Lansford PA. Is this just a strange coincidence?