Italian Dual Citizenship Message Board

I'm confused. I don't need the birth certificate if they were born in NYC? Do I need the death certificate instead?

I have a paternal great-grandfather who was born in Italy, immigrated to New York, fathered my grandfather, then became naturalized in the US a few years later. I have most of my required documents except my great-grandmother's birth certificate, who was born in New York City. Any ideas on how I can...