1.  George W. Wagenseller.  1899.  Snyder County Marriages, 1835-1899.  Wagenseller Publ., Middleburgh, PA (available as facsimile reprint from HigginsonBooks.com):

p. 201	Rev. C.G. Erlenmeyer's Marriage Record...
p. 212	1845...
p. 213	June 17, John Straub and Maria Houser, both of Perry Twp.

2.  Census Microfilm Records: Pennsylvania, 1850 (Broderbund CD-305, Disk 10).  Perry [now West Perry] Twp., Union [now Snyder] Co., PA, p. 106, 125/125, enumerated 18 Nov 1850 (extracted by Diana Gale Matthiesen):¤•

John H Straub	26	M	300	Penna
Mary	24	F		"
Susanah	4	F		"
Henry	1	M		"

Listed next to John's brother, George STRAUB. 

3.  1860 Census Images (online at Ancestry.com; Image #381 of 384):  Richfield P.O., West Perry Twp., Snyder Co., PA, p. 673, 1376/1436, enumerated 17 Jul 1860 (extracted by Diana Gale Matthiesen):¤•

John Stroup	34	m		Farmer		200	Pennsylvania
Mary     "	34	f			800		"
Susan    "	14	f					"
Mary     "	7	f					"
Barbara  "	4	f					"
Caroline "	1/12	f					"

4.  1870 Census Every-Name-Index/Images (online at Ancestry.com, Image #4 of 15):  Mt. Pleasant Mills P.O., West Perry Twp., Snyder Co., PA, Roll M593_1451, p. 205B, PN 4, 27/27, enumerated 8 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Stroup John H	44	M	W	Black-smith		200	Pa
"   Mary	44	F	W	Keeping house			Pa
"   Barbara	16	F	W				Pa
"   Caroline	10	F	W				Pa
"   Charles	7	M	W				Pa
"   Daniel S.	86	M	W	Farmer		2000	Pa

Daniel is, of course, John's father.  On one side, listed next to Henry TROUP; on the other side, listed next to Jacob S. WOMER, who is next to Levi TEATS, who is two households from John HAAS.

5.  1880 Census Every-Name-Index/Images (online at Ancestry.com, Image #40 of 44 — indexed "Mary M. Stroub"):  West Perry Twp., Snyder Co., PA, Roll T9_1194, p. 153D, PN 38, SD 7, ED 153, 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	10	13	23	24	25	26
5	5	Stroub Mary M?	W	F	54	/	Keeping house	/	Pa	Pa	Pa
		______ Charles	W	M	17				"	"	"

6.  1890 Census:  the 1890 Census Population Schedules were destroyed.

7.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #15 of 22):  Monroe Twp., Juniata Co., PA, Roll T623_1417, p. 115A, SN 8, SD 12, ED 121, enumerated 15 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
166	168	Stroup Charles H	Head	W	M	May 1863	37	M	18			PA	PA	PA	Farmer	0	Y	Y	Y	O	M	F	121
		[Charles's wife and children]
		______ Mary	Mother	W	F	Oct 1825	74	Wd		13	4	PA	PA	PA			N	*	Y

*Image too dark to read.