"Italia, Nati e Battesimi, 1806-1900," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XV1H-79M : accessed 17 February 2015), Pietra Marrone in entry for Maria Piazza, ; citing Bisacquino, Palermo, Italy, reference 210; FHL microfilm 1,350,516.
"Italy, Births and Baptisms, 1806-1900," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XV1H-CC7 : accessed 17 February 2015), Pietra Marrone in entry for Anna Maria Piazza, ; citing Bisacquino, Palermo, Italy, reference 135; FHL microfilm 1,350,517.
"Italia, Nati e Battesimi, 1806-1900," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XV1H-FYH : accessed 17 February 2015), Pietra Marione in entry for Antonino Piazza, ; citing Bisacquino, Palermo, Italy, reference 129; FHL microfilm 1,350,518.
"Italy, Births and Baptisms, 1806-1900," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XV1H-P4S : accessed 17 February 2015), Pietra Mirrone in entry for Vincenzo Piazza, ; citing Bisacquino, Palermo, Italy, reference 168; FHL microfilm 1,350,586.
"Italia, Nati e Battesimi, 1806-1900," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XV1H-T42 : accessed 17 February 2015), Pietra Marrone in entry for Salvatore Piazza, ; citing Bisacquino, Palermo, Italy, reference p 142 no 142; FHL microfilm 1,350,588.
"Italy, Births and Baptisms, 1806-1900," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XV1C-MLV : accessed 17 February 2015), Pietra Marrone in entry for Michele Piazza, ; citing Bisacquino, Palermo, Italy, reference 260; FHL microfilm 1,350,588.
"Alabama, Deaths, 1908-1974," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JD2H-38W : accessed 17 February 2015), Mary Maroni in entry for Pilici Piazzi, 13 May 1919; citing reference cn 186, Department of Health, Montgomery; FHL microfilm 1,908,215
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DNA Connections
It may be possible to confirm family relationships with Pietra by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Pietra: