Description {Mostly German} Includes letters from Speigelberg to: Peter Schwankel, Bonn, Germany; Johannes von Elmenau, Staatministerium fur Unterricht and Kultus, Bonn, Germany; Richard Schrank,Germany. Includes letters to Speigelberg from: Peter Schwankel, Bonn, Germany. Includes article by Peter Schwankel: Alexander Pfanders Nachlabtexts uber das virtuelle psychische. Includes letters from Peter Schwankel, Bonn, Germany to: Hans Reiner, Professor, Freiburg; Kurt Hobel; Julius Speer, Professor, Bonn,...