Lookslike you have gathered a lot of info - I saw some of your postings and answers on the Oregon website - you have pictures - that's wonderful! I have pictures of some of my Bakers and Allens, but don't know which ones they are because no one bothered to write names down or make any notations! I hope you find the date of death of Mary, Landon's wife. Where did Landon die? That might be a clue - or maybe she went to live with children or grandchildren? I would try to find the 1870 US Census for MO and search for his parents - might find them - best of hunting!