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Note:
A p. 218-220: Appendix 1: Anonymus, Questiones supra librum De celo et mundo, liber I, questio 23, Vtrum extra celum sit aliquod vacuum, Ms. Paris, Bibl. nat. lat. 16160, ff. 88vb-89rb; a p. 221-223: Appendix 2: Petrus de Alvernia (?), Questiones super libros De celo et mundo, liber I, questio 32, Vtrum sit ponere vacuum extra celum, Mss. Cremona, Biblioteca governativa 80, f. 108va-vb; Erlangen, Universitätsbibliothek 213, f. 9ra-va; Kassel, Stadt- und Landesbibliothek Phys. 2° 11, ff. 40vb-41ra
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