Espolt

Looking for surname of Espolt

With this information and the knowledge that this family is Lutheran where
would I look in the FHC library for records?
                                            
    1 Louis Espolt b: 5 January 1827 in Puttenhagen 22- Greifswald,
Prussia d: 7 August 1911 in Volga Twp.,Garnavillo, Ia Number of
children: 2
. +Christina Schultz b: 21 September 1825 in Krebsow, Reg. Stralsund
d: 12 June 1895 in Volga Twp.,Garnavillo, Ia Number of children: 2
        
........ 2 Mary Sophia Espolt b: 13 March 1856 in Krebsow, Stralsund,
Germany d: 17 July 1910 in New Richmond, Wisconsin Number of children: 11
............ +Emil L. Walleser b: 2 February 1847 in Philadelphia,
Pennsylvania m: 11 January 1880 in Garnavillo, Clayton Co., Iowa d: 22 May
1921 in Garnavillo, Clayton Co., IA Number of children: 11
........ 2 Christina (Lena) Espolt b: Abt. 1867
    
............ +Herman Schultz b: in Berlin, Germany m: 23 March 1887
                        
Thank You,
Theresa Walleser Key