I was interested in Joseph and looked on ancestry.com. There is a public tree that has been done and is available for viewing. One of the responses said that the "Harbours in America" book was on interlibrary loan and could be available at a Mormon center. I live in Central Ohio and we have such a center. Good to check in too. Joseph's wife was Mary Polly Stephens and were married in 1799 according to info on ancestry.com.