 Eight copies of the first edition exist in various libraries in North America and Europe, two of which lack the original frontispiece, and the other six of which lack also the first 32 pages.A ninth copy exists in Mexico divided between one owner who possesses the first volume, and another who possesses the other two.The errors and omissions were made good in the second edition by reference to the original manuscript which, so Franco discloses, was in the library of Don Andrés González de Barcia.