It is in the book "Index to Birth Records - Winnebago County, WI" vol #11838-1890. This book can be purchased from the Winnebagland Genealogical Society c/o Oshkosh Public Library, 106 Washington Ave, Oshkosh, WI54901 for 15.00 plus 3.00 shipping and handling. I forgot to mention if you want to send for the birth record from Winnebago County for Fredric it is vol 2 - page 98 - doc 252. In the index to marrage records I just found Sarah LaGrange married to D.E.Clark 6/23/1867 - vol 1 - page 345 - doc 2056 No record of a George Rogers Clarke in my index books, but they only cover winnebago county - births 1838-1890, marriages 1848-1902 and deaths 1842-1897. Hope this helps! Good hunting!