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

Thompson, Presley O.

Clark, Mary Jane

6 Jan 1836

Christian Co.

1b.  D.L. Murray & N.R. Murray.  1995.  Marriage Index: IL, IN, KY, OH, TN, 1720-1926.  (Broderbund CD-2):

Thompson, Presley N.O.

Krvin (sic), Virginia K.

18 Dec 1851

KY

Christian Co.

2.  1840 Census Index and Digital Images (online at Ancestry.com; Image #95-96 of 98; extracted by Diana Gale Matthiesen):

1840

KY

Christian Co.

p. 237

Presley N.O. Thompson

100 010 - 200 010

no slaves

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1835-1840	= James (b. 1840)
1 male	20-29	1810-1820	= Presley (b. 1811/2)
2 females	4 or under	1835-1840	= Almyra (b. 1838/9) = Selina (b. 1836/7)
1 female	20-29	1810-1820	= Mary
1	person engaged in agriculture

Listed three lines below Henry HOPSON and four lines above Evan HOPSON.

3.  1850 Census Index/Microfilm (online at GenealogyLibrary.com — indexed as "Presley N.Q. Thompson"):  District 2, Christian Co., KY, p. 412, 771/818, enumerated 10 Oct 1850 (extracted by Diana Gale Matthiesen):

Presley N.O. Thompson	38	M	Farmer	KY
Selina          "	13	F		KY
Almyra          "	11	F		KY
James           "	9	M		KY
Virgil B.       "	6	M		KY
Mildred         "	5	F		KY

Living between James F. THOMPSON (Presley's brother) and Anna/Amy (BOBBITT) THOMPSON (Presley's mother). 

5.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).