1a.  Anon.  1966.  Marriage Index:  Ohio, 1789-1850.  Liahona Research, Orem, UT (Broderbund CD-400):  not found.

1b.  Allen L. Potts.  Marion County, Ohio, Probate Court Marriage Records, Vols. I-XII, 1824-1902 (online at Heritage Pursuit):

Dunkleberger, John

Culp, Elizabeth

01/02/1830

JP Michael Alspach

2.  1830 Census Index and Digital Images (online at Ancestry.com; Image #5-6 of 7; extracted by Diana Gale Matthiesen):¤•

1830

OH

Marion Co.

Richland Twp.

pp. 165A-165B

Ln. 15

John Dunklebarger

000 020 - 000 010

00001

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	20-29	1800-1810	= foreigner = John (b. 1808)
1 female	20-29	1800-1810	= Elizabeth (b. 1805/6)
1	foreigners not naturalized

3.  1840 Census:  can't find Elizabeth.  As a widow, she's probably living with kin, so didn't show up as head-of-household.

4a.  1850 Census Index/Images (online at Ancestry.com; Image #17 of 18):  Tully Twp., Marion Co., OH, p. 65A, 117/117, enumerated 4 Oct 1850 (extracted by Diana Gale Matthiesen):

John Engle	74	M	Farmer	400	Pa
Elizabeth "	44	F			"
Hester    "	15	F			O

John ENGLE is Elizabeth's second husband.  They are listed ten households from John's son, Moses ENGLE, and his wife, Susannah DUNKLEBERGER, our subjects' daughter. 

4b.  1850 Census Index/Images (online at Ancestry.com; Image #6 of 16 — mis-indexed "Cross"):  Steuben Twp., Steuben Co., IN, p. 185B, 906/906, enumerated 21 Oct 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):¤•

Jacob Cup	31	M		Farmer	1200	Oh
Dorcas "	31	F				Oh
[Jacob & Dorcas's children, et al.]
Rebecc Dunclebarger	16	F				Oh

Jacob CUPP is Elizabeth's brother — I guess Rebecca didn't like living with her step-father.

5.  The Gene Pool (online at Ancestry.com; missing columns contained no data):

Name	Birth Date	Birth Place	Father	Mother
Rebecca May Dunkleberger	1833	Richland Twp, Marion, OH	Johannes/John Dunkleberger	Elizabeth Cupp

6.  U.S. Dept. of the Interior, Bureau of Land Management. The Official Land Patent Records Office.

Date	Cert.No.	Land Office	Authority	Patented By	Acres	Aliquot Sec.Twp.Rng	State	County*
28 May 1835	12002	Bucyrus	sale-cash	John Dunkleberger of Marion County Ohio	40	SE¼ SW¼ S32.T4S.R17E	OH	Marion
*The county is not given on the original certificate, which describes the location of the land solely in terms of Aliquot, Section, Township, and Range.  The county names must have been added to the database at some later time, probably when the certificate data were computerized.

7.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).

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

9.  1880.  History of Morrow County.

Also in Marion County Ohio in this same time frame is Elizabeth Culp born about 1805 in PA.  In January, 1830 in Marion County, she married John Dunkleberger.  John died sometime after February 1836.  They had 3 children, Susannah b 1831, Rebecca b. 1835 and Hester "Nancy" b. 1837.  In 1846 she married John Engle who was about 30 years her senior.  Elizabeth's daughter Susannah married John Engle's son, Moses Engle and both families moved to Fulton County, Indiana.  John died in Pulaski Co. in 1854.