I do mostly KARNS family research. I don't know much about DOBKINS families, except that many of them seemed to move around the Country and are hard to trace. Michael & Mary KARNS lived in southwest Lee Co., VA. in 1830, just north of the State Line and Claiborne Co., TN. Rachel Karns was one of their daughters, and she married Jacob DOBKINS on 9 Feb 1832 in Lee Co., VA. Then they moved to nearby Claiborne Co., TN. where they appeared on the 1840 Census, next to Alexander DOBKINS. Meanwhile, Rachel's parents had moved on to Buchanan Co., MO. where they appeared on the 1840 Census.
While researching the KARNS family in Buchanan Co., MO., I found some land records there for an Alexander DOBKINS. They seem consistent with what little I know of the Alexander DOBKINS who married Mary Ann NEIL? in Claiborne Co., TN. on 18 Mar 1839. It seems likely that they were the DOBKINS family who moved on to Tarrant Co., TX., and were buried on the present DFW Airport grounds.
Alexander DOBKINS was listed on the BLM web-site as a "Patentee" of 160 acres, officially granted on 4/1/1846. Since the land title application process normally took 2 or 3 years, it's reasonable to assume that he was in Buchanan Co., MO. by about 1843 or 1844. I don't know if he bought other land tracts in the area from the State or by Deeds. However, I did find that he sold several tracts as recorded in the Buchanan Co., MO. "Grantees" Deed Index: (Bk.A-p.431) - He sold 80a. on 5/15/1844 (Bk.C-p.358) - He sold 40a. on 2/15/1847 (Bk.G-p.103) - He sold 80a. on 9/28/1850 The first sale was for half of the land that wasn't officially "Patented" to him by the Federal Government until 4/1/1846. However, if he had proof that a Patent was pending, he was allowed to sell it. It was common for early settlers to sell part of their land to buy seed and supplies so they could farm the rest of their land. It's also of interest that the County recorder squeezed his wife's name of "Mary Ann" into the Deed Index for the first land sale. I have not seen the actual Deeds and don't know the details contained therein. But a wife's permission was always required, and she should have been mentioned on all of those Deeds, if she was still alive at the time of each sale.
The location of the several tracts sold was near to where U.S. Hwy. 169 crosses the Platte River. It might be of significance that these tracts were roughly 3 miles east of where Michael & Mary KARNS settled, and were buried. Michael & Mary could both read and write, and probably sent letters back to their daughter Rachel DOBKINS in Claiborne Co., TN. Their descriptions of the pristine rich black soil in northwest Missouri may have enticed Alexander DOBKINS to move there. This is speculation, but is certainly reasonable.
Except for land records, there are very few records that Alexander DOBKINS was ever in Buchanan Co., MO. He was still in Claiborne Co., TN. for the 1840 Census, did not appear on the 1842 Buchanan Co. Tax list, and I can't find him listed there on the 1850 Census. It's likely that he was in Buchanan Co. in 1850, but may have been one of the few folks that was missed by the Census-taker. That's why the land records are important to anyone who's trying to track him and don't know where in Missouri he was. I hope this posting helps someone figure out the elusive migrations of Alexander DOBKINS.
I would appreciate a reply from anyone who can tell me (or even make a reasonable guess) if this was the same Alexander DOBKINS who died 1869 and was buried on the DFW Airport grounds. Judging from the Claiborne Co. Census and marriage records, I estimate that he was born about 1815 in TN. It seems possible that he was a younger brother of Jacob DOBKINS, who was born 29 Dec 1811 in TN., and died 7 Jun 1870 in Cooke Co., TX.