Koll Surname

Hello,
Would anyone be able to help me find information on the Henry Franz
Koll family from Hanover, Hannover? His date of birth was 16
October 1821. He married Louisa Elizabeth Findorf from Lueneberg
Germany. Her date of birth was 6 September 1819. They immigrated to
US in 1866. They had a son John H Koll on 12 May 1863 in Suenneberg
Germany. They also had a son Henry and a daughter Katarina. My
folks are coming to Germany in June and any info that would help me
narrow this down would be appreciated. She has worked on genealogy
for 30 years but doesn't know how to use the computer. She only
knows the old fashioned way of letter writing. Is there an archive I
should pursue first? Thanks in advance.

S Jones

I think it should be "Lüneburg" (or Lueneburg), there some Koll and Findorff addresses.
I'm not familiar with this area. See also: www.lueneburg.de
Good luck,
Werner