Marriages by Alphabetical Order RO-RZ Robbert, Frederich W. age 22 andPons, Louisa Annaage 23m.02/09/1897vol. 19page 673
You can probably order this record.I don't know how but there are likely directions somewhere in the website.The record may also name parents.
Possible birth and parents for Fred Robbert same website Birth Index by Alphabetical Order RO-RT Robbert, Frederick Williams/o Henry(Robbert) andEmma Anna Schneider; sex M-b.04/05/1875vol. 63page 274 Note:Two of Fred and Louisa's children are also on this page.
Possible birth and parents for Louisa Birth Index by Alphabetical Order PL-PZ Pons, Louise Johanna d/o Michel (Pons)andLouise Willamine Waldo;sex F- b.08/19/1873vol.61page 826
Keep in mind that tombstone dates aren't always an exact match with other records found.