AKC Works 005
Fletcher in AHSI 162 783, p. 567, describes the item as a five quarto sides in Kircher's hand, no corrections, dated April 1636 and addressed to Cardinal Francesco Barberini - Bibl. Nat. Fonds français, n.a. 10638, f. 18. a similar document is preserved in the Vatican Archives, Vat. Int. 10486, f. 9.