Liberati/Millozzi Connection

[Liberati]

I am looking for information on my cousin Pietro "Peter" Liberati and his wife, Nazarena Clara Millozzi. Peter was born on March 29, 1906 - presumably in Rome but maybe in Amatrice where his father Luigi Liberati was born on May 11, 1885. Peter's wife Clara was born on July 10, 1909 (or maybe October 7, 1909) in Florence, I believe. Clara later died in Rome on June 10, 1975. Peter died in Rome sometime in the 1990s. On a side note, Peter lived in the U.S. (in New Mexico) from roughly 1913-1925 before returning with his parents to Rome. Anyways, any tips on how to find information about them (marriage record, obituaries, etc.) would be much appreciated. Thanks!