1.  Marriage Record:

2.  1870 Census Every-Name-Index/Images (online at Ancestry.com):  Joseph STROUP (æ 18, b. PA) is living in Truro Twp., Knox Co., IL, with his parents (q.v.).  Mary E. CRABTREE (æ 14, b. MO) is living in Osage Twp., Camden Co., MO (p. 529A), with her parents, Miles H. CRABTREE (æ 51, b. IN) & Sarah (æ 40, b. TN), her brother, John F. CRABTREE (æ 16, b. MO), and other siblings.

3.  1880 Census Every-Name-Index/Images (online at Ancestry.com, Image #9 of 35):  Saltspring [Salt Springs] Twp., Randolph Co., MO, Roll T9_712, p. 170A, PN 9, SD 5, ED 114, enumerated 8 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤•

1880:  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	8	9	10	13	24	25	26
74	81	Strop Joe	W	M	38			/	Coalminer	Penn	Penn	Penn
		_____ Mary	W	F	24	Wife		/	Keeping House	Mo	France	Tenn
		_____ J A	W	M	3	Son	/			Mo	Penn	Mo

The son's first initial has a long descender.

4.  1890 Census:  the 1890 Census Population Schedules were destroyed.

5.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #22 of 29):  Osage Twp. (East part), Camden Co., MO, Roll T623_845 (Book 1), p. 80B, SN 11, SD 8, ED 8, enumerated 23 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

27

28

205

205

Stroup Joseph

Head

W

M

Feb 1852

48

M

24

PA

PA

PA

Farmer

0

N

N

Y

R

F

175

______ May

Wife

W

F

Feb 1856

44

M

24

2

2

MO

IN

TN

Keeping House

Y

Y

Y

______ Ira A

Son

W

M

May 1887

23

S

MO

PA

MO

Farm Laborer

0

Y

Y

Y

______ John H

Son

W

M

Sep 1884

15

S

MO

PA

MO

Day Laborer

0

Y

Y

Y

Crabtree John F

Bro-in-law

W

M

Jun 1843

46

W

MO

IN

TN

Farm Laborer

0

Y

Y

Y

6.  1910 Census Every-Name-Index/Images (online at Ancestry.com, Image #5 of 27):  Main Street, Linn Creek Village, Osage Twp., Camden Co., MO, Roll T624_772, p. 237A, SN 3A, SD 8, ED 33, enumerated 18 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	10	11	12	13	14	17	18	19	20	23	24	26	28
*	43	44	Stroup Joseph	Head	M	W	58	M1				PA	PA	PA	Eng	Baker	own shop	OA	N	N	R	H
			______ Mary E	Wife	F	W	54	M1	33	2	2	MO	IN	TN	Eng	None			Y	Y
*Main Street

7.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #2 of 35):  Versailles City (East Ward), Moreau Twp., Morgan Co., MO, Roll T625_935 (Book 2), p. 238B, SN 1B, SD 8, ED 128, enumerated 5 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).

3

4

5

6

7

9

10

11

12

16

17

18

19

21

23

25

26

27

28

22

23

Stroup Joseph

Head

R

M

W

66

M

N

N

PA

PA

PA

Y

Miner

Coal Mine

W

______ Mary E

Wife

F

W

63

M

Y

Y

MO

IN

TN

Y

None

Crabtree Josephine

Niece

F

W

13

S

Y

Y

Y

MO

MO

MO

Y

None

Listed four households from Richard B. STROUP (æ 32, b. MO/PA/MO), who is next to Joseph's brother, "Bauch" STROUP (æ 53, b. PA/PA/PA).

8.  1930 Census Every-Name-Index/Images (online at Ancestry.com):  can't find.

9.  Rockdale Cemetery [Camden County, Missouri] (online at Pat (Cahill) Calton's web site):

Stroup, Joe	1852 - 1957
Stroup, Mary E.	1850 - 1927	wife of Joe STROUP

The page includes photographs of the stones, and Joe's death year is 1937, not 1957, which makes a great deal more sense given his age.  I cannot clearly read the dates on Mary's stone in the photo, but the death year has something roundish as the last character, possibly 1923 or 1928, definitely not 1927.  Also buried here:  their son, Ira, and his wife, Dora.