Awesome ! In 1870 census, William R Burke, who married Jesse Greenfield in 1879, is listed as a book (or back) merchant. His brother, John Burke, is a forwarding and commission merchant. In 1875, William purchased a wharfboat. In the 1880 census, W R is a newspaper publisher and John is a printer.
John died in 1881 and William moves to Los Angeles where he becomes a very rich land developer.
Yhank you for your help.