| Sources  | 
- [S19]  1900 US Federal Census, (www.ancestry.com). 
 
  
- [S30]  1910 US Federal Census, (www.ancestry.com). 
 
  
- [S24]  1920 US Federal Census, (www.ancestry.com). 
 
  
- [S25]  1930 US Federal Census, (www.ancestry.com).
 
Name:  	Harry Ehrhardt 
Home in 1930: 	Clarkstown, Rockland, New York 
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Age: 	31 
Estimated birth year: 	abt 1899 
Relation to Head of House: 	Son 
Father's Name: 	Johan P 
Mother's Name: 	Sophia 
Race: 	White 
 
  
- [S891]  World War I Draft Registration Cards, 1917 - 1918, (www.ancestry.com).
 
Name:  	Harry Stephen Ehrhardt 
County: 	Rockland 
State: 	New York 
Birth Date: 	5 Jul 1899 
Race: 	White 
FHL Roll Number: 	1818812 
DraftBoard: 	1 
  
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