Includes material relating to H.V. Recklinghausen {note: almost all material is in German}. Includes letters from Speigelberg to: Josef H. M. Habbell, Koln, Germany; Bosch and Speidel, Stuttgart, Germany; Deine Tante Gerta. Includes letters to Speigelberg from: Josef H. M. Habbell, Koln, Germany; Bosch and Speidel, Stuttgart, Germany; Theodore Steinkopff, Dresden, Germany; Deine Tante Gerta; Debabrata Sinha, Brock University, Ontario, Canada; Masayuki Hakoishi, Iwate university, Morioka, Japan