Additional publications we consulted converge in support, such as theStatistical topography of the Papal State , written by the doctor and polygrapher Adone Palmieri in 1857 containing an in-depth historical and economic excursus on the municipalities and lands that fell within the administrative boundaries of the Comarca of Rome. The author opens the book by describing the work of widespread planting of tree species that was carried out from the second half of the 19th century, underlining in particular that «from 1850 to the end of 1855 […] 6321 mulberry trees were awarded», and continues in his walk through the municipalities of the Roman province mentioning the spinning mills of Albano, Frascati, Palestrina, and finally the «large silk spinning mill» of Zagarolo. The latter news was confirmed four years later by the bibliographer and pontifical dignitary Gaetano Moroni in the last volume of his Dictionary of historical-ecclesiastical erudition  of 1861, which under the heading Zagarolo reports "has a silk spinning mill."

The most recent document in which the spinning mill is mentioned is, finally, an anonymous typescript from 1958, initialed only «cg» and traced in the Diocesan Historical Archives of Palestrina, in which it is noted «it is relevant that in the same street ( del Colle, ed.) there is news of a silk spinning mill".