Cementary documents Ferdinand Dubois County Indiana

Who can help? I need burial documents of:

- John Henry Niehaus, emigrated before 1839 from Damme to USA,
  died on December 24, 1901 in Ferdinand Dubois County Indiana

Should be born April 17, 1814 in Damme, but the date of birth is wrong, no parents is given.
Married 1839 Cumberland, Maryland to Maria Agnes Grevenkamp.

- Herman Ruhe, should be born May 27, 1829 in Damme, but must be wrong,
  married in USA to Bernardina Rottinghaus from Damme,
  died on June 2, 1902 in Ferdinand Dubois County Indiana

I hope to find the names of the parents.

Thank you,
Werner Honkomp