1a.  Indiana Marriage Collection, 1800-1941 (online at Ancestry.com):

Name:	Charles G. Thornburg	Chas. V. Thornburgh
Spouse Name:		Ada F. Addison
Marriage Date:		22 Sep 1895
Marriage County:	Hancock	Hancock
Father Name:	Seth
Mother Name:	Mahala Bookout
Source Title-1:	Hancock County, Indiana	Hancock County, Indiana
Source Title-2:	Index to Supplemental Record Marriage Applications	Index to Marriage Records 1828-1920 Inclusive Volu
Source Title-3:	W.P.A. Original Record Located: County Clerk's O	W.P.A. Original Record Located County Clerk's Of
Book:	C-4	C-9
OS Page:	292	150

1b.   Indiana Marriages, 1780-1992 (online at familysearch.org):

Groom's Name:	Charles G. Thornburg
Bride's Name:	Diamond G. Scott
Marriage Date:	20 Jul 1911
Marriage Place:	Hancock, Indiana
Groom's Father:	Seth Thornburg
Groom's Mother:	Mahala Bookout
Bride's Father:	Albert C. Scott
Bride's Mother:	Nancy E. Shipley
Source Film:	1302734

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

Name: Charles G. THORNBURGH Birth: 9 Sep 1870, Springfield, Wayne, IN Father: Seth THORNBURGH; Mother: Mahalah J BOOKOUT Marriage: 22 Sep 1895, Charlottesville, Henry, Indiana Spouse: Ada F. ADDISON Birth: Abt 1874, of Henry, IN Father: John ADDISON; Mother: Jane COLTRAIN Source: patron submission

3.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #18 of 19):  Jackson Twp., Hancock Co., IN, Roll 375, p. 157B, SN 9, SD 6, ED 49, enumerated 21 Jun 1900, official enumeration date 1 Jun 1900 (extracted by Diana Gale Matthiesen):

1900:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	19	20	22	23	24	25	26	27	28
214	217	Addison John	Head	W	M	Jan 1820	80	M	32			OH	NC	NC	Farmer	0	Y	Y	Y	O	F	F	109
		"    Jane	Wife	W	F	Jul 1833	66	M	32	1	0	IN	IN	VA			Y	Y	Y
		Thornburg Charles G	S-in-law	W	M	Sep 1870	29	M	5			IN	IN	IN	Farming	0	Y	Y	Y
		"      Ada F	Dau	W	F	Nov 1872	27	M	5	0	0	IN	OH	IN			Y	Y	Y

4.  1910 Census Every-Name-Index/Images (online at Ancestry.com, Image #5 of 22):  Jackson Twp., Hancock Co., IN, Roll T624_353, p. 191A, SN 3A, SD 6, ED 69, enumerated 22 Apr 1910, official enumeration date 15 Apr 1910 (extracted by Diana Gale Matthiesen):

1910:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	12	13	14	17	18	19	20	21	22	23	24	26	27	28	29
32	32	Thornburg Charles G	Head	M	W	39	M1	15	IN	IN	IN	Eng	Farmer	Gen Farm	Emp	N	0	Y	Y	O	F	F	20
		_________ Adda F	Wife	F	W	36	M1	15	IN	IN	IN	Eng	None					Y	Y

5a.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #6 of 14):  Jackson Twp., Hancock Co., IN, Roll T625_436, p. 232B, SN 3B, SD 6, ED 51, enumerated 10 Jan 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):

1920:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
2	3	4	5	6	7	8	9	10	11	12	17	18	19	21	23	25	26	27	28	29
Fm	75	75	Thornburgh Charley	Head	O	F	M	W	49	M	Y	Y	IN	IN	IN	Y	Farmer	General Farm	OA	56
			__________ Diamond	Wife			F	W	29	M	Y	Y	IN	IN	IN	Y	None

5b.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #12 of 14):  Jackson Twp., Hancock Co., IN, Roll T625_436, p. 235B, SN 6B, SD 6, ED 51, enumerated 17 Jan 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):

1920:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
2	3	4	5	6	7	8	9	10	11	12	17	18	19	21	23	25	26	27	28
X	173	173	Addison Adah F	Head	O	F	F	W	47	W	Y	Y	IN	IN	IN	Y	Keeper	Boarding House	W

Plus three boarders not extracted.  It's not unusual for a divorced woman to save face by calling herself a widow (my own grandmother did that very thing).  The fact that she returned to her maiden name suggests the marriage was anulled, possibly on the grounds of infertility — ironically as it happened because it was apparently Charles who was infertile. 

6.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #8 of 24):  Jackson Twp., Hancock Co., IN, Roll 591, p. 124B, SN 4B, ED ??-13, SD 9, enumerated 10 Apr 1930, official enumeration date 1 Apr 1930 (extracted by Diana Gale Matthiesen):

1930:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
3	4	5	6	7	10	11	12	13	14	15	16	17	18	19	20	24	25	26	27	28	30	32
92	94	Thornburg Chas G	Head	O	Y	M	W	56	M	29	N	Y	IN	IN	IN	Y	farmer	General farm	O	Y	N	83
		_________ Diamond	Wife			F	W	40	M	22	N	Y	IN	IN	IN	Y	none

7.  Public Member Trees (online at Ancestry.com).

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