hmm... again I think you will need to apply for the marriage cert for David and Cora Anderson.
I was hoping there would have been a Cora A ... age 4 living in Mannington, Salem in 1880 but the nearest one I could find was a Cora Johnson aged 10 months. which would mean she was only 11 when she married! There are a few other Coras living in Salem but the only other non white one is age 2 living with her Grandmother (Cora Jones) in Pilesgrove Salem
the Pilesgrove Cora might be the right one, I've just seen on wiki that Pilesgrove boarders Mannington
I can't find a non white David Anderson living anywhere in NJ of the right age

sorry.
ps... my paternal grandmother was also called Dorothea Anderson but she came from England, small world isn't it!
