1. University of Pennsylvania, Halper 168 DS ID: DS25695 Title: Treatise on prayer Date: 12th century-13th century?
2. University of Pennsylvania, Halper 167 DS ID: DS25838 Title: Treatise on prayer Date: 12th century-13th century?
3. University of Pennsylvania, Halper 169 DS ID: DS26040 Title: Treatise on prayer Date: 11th century-13th century?