1.  Jordan R. Dodd, ed.  1993.  Kentucky Marriages:  Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):

Cobb, Robert C. [sic]

Mims, Cornelia

May 13, 1835

Caldwell Co.

2.  1840 Census Index and Digital Images (online at Ancestry.com; Image #29-30 of 94; extracted by Diana Gale Matthiesen):

1840

KY

Caldwell Co.

pp. 15B-16A

Cobb R L

300 001 - 001 110

100 000 - 011 000

0010000

These data indicate:ernate

No. & Sex	Age Class	Therefore Born	Individuals Inferred
3 white males	4 or under	1835-1840	= Joshua (b. 1838/9) = Linah (b. 1837/8) = Robertson (b. 1835/6)
1 white male	30-39	1800-1810	= Robert (b. 1804/5)
1 white female	10-14	1825-1830	= Rebecca MITCHELL? (b. 1828/9)
1 white female	15-19	1820-1825	= ?
1 white female	20-29	1810-1820	= Cornelia (b. 1816/7)
1 male slave	9 or under	1830-1840	= ?
1 female slave	10-23	1816-1830	= ?
1 female slave	24-35	1804-1816	= ?
1	person employed in commerce

Robert is old enough to have fathered the two older girls, but I have found no earlier marriage for him.  One of them could be Rebecca MITCHELL, who is living with them in the 1850 census.  Listed one line above Thomas CRESAP, who is four lines above Hanson B. CRESAP.

3.  1850 Census Index/Microfilm (online at GenealogyLibrary.com) and 1850 Census Images (online at Ancestry.com; Image #96 of 124):  District No. 1, Caldwell Co., KY, p. 326B, 692/692, enumerated 13 Sep 1850 (extracted by Diana Gale Matthiesen):

Robert L. Cobb	45	M	Merchant	10,600	Caldwell cty Ky
Cornelia R.  "	33	F			Virginia
Robertson H. "	14	M			Caldwell cty Ky
Lina M.      "	12	M			"
Joshua C.    "	11	M			"
Sam Glenn    "	4	M			"
Rebecca      "	1	F			"
Gideon D.    "	30	M	Merchant	1,600	"
O. M. Jenkins	26	M	Merchants Clark		Maryland
Rebecca C. Mitchell	21	F			Christian cty Ky

4.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

5.  Terry Reigel.  Reigel Roots. [link died]