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Hello Mr. Colello,
Thank you for contacting History Hub about naturalization and immigration records. If you have the index cards for their naturalization records, that is the perfect information to request the petition records. You can read more about naturalization records and immigration records online.
You may contact our New York Regional Archives for their naturalization records. The Archives contact information is below. Or, you may Order Reproductions Online.
The National Archives at New York City
One Bowling Green, 3rd Floor
New York, NY 10004
(866) 840-1752 or (212) 401-1620
FamilySearch is a great free online resource to find genealogy records. The New York Online Genealogy Records wiki created by FamilySearch lists many alternative digital resources that may be helpful with your research.
In your search for German ancestry records, it is helpful to search the catalogs on familysearch.org and ancestry.com with keyword Germany. The wiki pages on familysearch.org. Go to the research wiki selection, use the search bar to find Germany genealogy, then scroll down to find Germany online or German by state. I found on Ancestry.com a collection for U.S., Departing Passenger and Crew Lists, 1914-1966.
You may research the Library of Congress guide to genealogy online. Or, German genealogy resources at the Library of Congress.
I hope this information is helpful. Best of luck with your research!