1U.S. Passport Applications, 1795-1925, ancestry.com. "Name: Charles Koberstein
Birth Date: 11 Apr 1865
Birth Place: Grevenbroick, Germany
RESIDENCE: Jersey City, NJ
Passport Issue Date: 24 Feb 1904
Passport Includes a Photo: N
Source: Passport Applications, 1795-1905 (M1372)."
11900 U.S. Federal Census, New Jersey, ancestry.com. "Name: Joseph Koberstein
Home in 1900: Jersey City Ward 3, Hudson, New Jersey
Age: 5
Birth Date: Dec 1895
Birthplace: New Jersey
Race: White
Ethnicity: American
Relationship to head-of-house: Son
Father's Name: Charles
Father's Birthplace: Germany
Mother's Name: Katie
Mother's Birthplace: Germany
Marital Status: Single
Residence : Jersey City, Hudson, New Jersey."
11900 U.S. Federal Census, New Jersey, ancestry.com. "Name: Charles Koberstein
Home in 1900: Jersey City Ward 3, Hudson, New Jersey
Age: 7
Birth Date: Feb 1893
Birthplace: New Jersey
Race: White
Ethnicity: American
Relationship to head-of-house: Son
Father's Name: Charles
Father's Birthplace: Germany
Mother's Name: Katie
Mother's Birthplace: Germany
Marital Status: Single
Residence : Jersey City, Hudson, New Jersey."
1U.S. Passport Applications, 1795-1925, ancestry.com. "Name: Joseph Koberstein
Birth Date: 15 Jan 1872
Birth Place: Grevenbroich, Germany
RESIDENCE: Jersey City, New Jersey
Passport Issue Date: 26 Aug 1901
Passport Includes a Photo: N
Source: Passport Applications, 1795-1905 (M1372)."2Germany Baptisms 1700-1900, FamilySearch.com. "Name: Joseph Koberstein
Gender: Male
Christening date: 16 Jan 1872
Christening place: CIVIL, GREVENBROICH, RHEINLAND, PRUSSIA
Residence: Grevenbroich, Rheinland, Preussen
Father name: Olaus Koberstein
Mother name: Elisabeth Franzen
Batch number: C96151-6
Date range: 1871 - 1876
Record group: Germany-VR
Film number: 958150
Collection: Germany Baptisms 1700-1900."