1.  Marriage Record:

2.  1890 Census:  the 1890 Census Population Schedules were destroyed.

3a.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #4 of 10):  Evan Twp., Kingman Co., KS, Roll T623_484, p. 252B, SN 2, SD 7, ED 109, enumerated 9/11 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	16	17	19	22	23	24	25	26	27	28
29	29	Strope WM	Head	W	M	Jul 1840	59	M	5			OH	OH	WV			Farmer	Y	Y	Y	O	M	F	29
		______ Henritte	Wife	W	F	Mar 1853	49	M	5	1	1	Eng	Eng	Eng	1887	13		Y	Y	Y

If Henrietta has a surviving child, who is it?  It must have been Charles's child.

3b.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #7 of 13):  Lincoln Twp., Sedgwick Co., KS, Roll T623_499, p. 107A, SN 4, SD 7, ED 264, enumerated 18-20 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	16	17	19	20	22	23	24	25	26	27	28
74	74	Tear L W A	Head	W	M	Feb 1869	31	M	5			IL	OH	OH			Farmer	0	Y	Y	Y	R	F	F	68
		____ Lillie C	Wife	W	F	Dec 1875	24	M	5	1	1	Eng	Eng	Eng	1887	13			Y	Y	Y
		____ Florence A	Dau	W	F	Apr 1896	4	S				KS	IL	Eng
		White Fanny M	S-in-Law	W	F	Feb 1879	21	S				Eng	Eng	Eng	1887	13	School Teacher	3	Y	Y	Y

4.  1910 Census Index/Images (online at Ancestry.com, Image #16 of 17):  Gypsum Twp., Sedgwick Co., KS, Roll T624_455 (Part 3), p. 76B, SN 8B, SD 8, ED 86, enumerated 9 May 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).
2	3	4	5	6	7	8	9	10	11	12	13	14	15	17	18	19	20	23	24	26	27	28	29
157	Strope William	Head	M	W	69	M2	15			OH	OH	Ger German		Eng	Farmer	General farm	Emp	Y	Y	O	F	F	161
	______ Henrietta	Wife	F	W	57	M2	15	2	0	Eng English	Eng English	Eng English	1877	Eng	None			Y	Y

5.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #5 of 20):  Riverside Twp., Sedgwick Co., KS, Roll T625_548, p. 199A, SN 3A, SD 8, ED 109, enumerated 13 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	13	14	17	18	19	20	21	22	23	24	25	26	27	28	29
fm	57	57	Strope William	Head	O	F	M	W	78	M			Y	Y	Ohio		Pennsylvania		Berlin Germany	German	Y	farmer	truck farming	OA	51
			______ Henrietta	Wife			F	W	66	M	Un	Na	Y	Y	England	English	England	English	England	English	Y	none

6.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #11 of 17):  Franklin Avenue, Sedgwick City, Harvey Co., KS, Roll 705, p. 229A, SN 6A, ED 40-21, SD 49, enumerated 23 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).
1	3	4	5	6	7	8	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	30
*	155	188	Tear Arthur L	Head	O	3000	N	M	W	60	M	25	N	Y	Illinois	Ohio	Vermont				Y	Agent	Insurance	O	Y	N
			____ Lilbyie? C	Wife				F	W	54	M	19	N	Y	England	England	England	English	1887	Na	Y	None
			Strope Henrietta	M-in-law				F	W	77	Wd	25	Y	Y	England	England	England	English	1887	Na	Y	None
*Franklin Avenue

7.  Messages posted to the White Family Genealogy Forum (online at GenForum.com).  See especially Message #23819.

8.  Message posted to the WHITE Surname Board (online at Ancestry.com/RootsWeb.com).