41. University of Pennsylvania, Halper 160 DS ID: DS25794 Title: Responsa Date: 11th century-13th century?
42. University of Pennsylvania, Halper 164 DS ID: DS25930 Title: Responsa Author: Hai Gaon Date: 10th century-12th century?
43. University of Pennsylvania, Halper 156 DS ID: DS25987 Title: Responsa Author: Hai Gaon Date: 12th century-14th century?