1.  George W. Wagenseller.  1919-20.  Snyder County Annals: a Collection of All Kinds of Historical Items Affecting Snyder County from the Settlement of the First Pioneers in This Section to the Names of the Soldiers in the World War, 1917-1919.  2 vols.  Middleburgh Post, Middleburgh, PA (excerpt posted to the Straub Surname Board online at Ancestry.com):

From Vol 1, from a New Berlin newspaper, on page 120, a mention of the following: "Stroup, Mrs. Jarsanna (nee Dressler), widow of Jacob B., route 1, Liverpool; born Susquehanna Township, Juniata County, March 13, 1833."

2.  1860 Census Images (online at Ancestry.com; Image #12 of 21):  Mahontongo P.O., Susquehanna Twp., Juniata Co., PA, Roll M653_1119, p. 793, PN 233, enumerated 2 Aug 1860, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤•

1860:  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	7	8	9	10	11	12
1610	2	Jacob Stroup	31	M	Farmer	2000	800	Penna
		Susan	27	F				"
		Moses	8	M				"		/
		Elizabeth	6	F				"		/
		Frederick	3	M				"
		Elmira	1	F				"
		Daniel Stroup	29	M	Laborer		300	"	/
		Susanna Stroup	20	F				"	/

Daniel STROUP is Jacob's brother, and Susanna is Daniel's wife. 

3.  1870 Census Images (online at Ancestry.com; Image #5-6 of 23):  Mahontongo P.O., Susquehanna Twp., Juniata Co., PA, p. 464A, PN 5-6, 35/36, enumerated 12 Aug 1870 (extracted by Diana Gale Matthiesen):¤•

Stroup J B	40	M	Farmer	3000	700	Pa
Jesaminah?	37	F				Pa
Moses	18	M	F $			Pa
Elizabeth	16	F	H $			Pa
Fredrick	13	M				Pa
Elmer	11	M				Pa
Jacob	8	M				Pa
Daniel	6	M				Pa
[next page]
Stroup Jacob	3	M				Pa

"Jesaminah" should be Josanna or Josannah; "Elmer" should be Elmira; the second "Jacob" should be Jonathan.  I can't imagine what the enumerator thinks he is abbreviating with his "$" symbol; he uses it frequently.  They are living next door to Daniel & Lydia (HEIMBACH) STROUP. 

4.  1880 United States Census and National Index (LDS Family History Resource File: CD-ROM Library):¤•

Census Place: Susquehanna, Juniata, Pennsylvania
Source: FHL Film 1255137; NARA Film T9-1137; Pg 362A
	Relation	Sex	Marr	Race	Age	Birthplace	Occupation	Fa	Mo
Jacob STROUP	Self	M	M	W	49	PA	Farmer	PA	PA
Josanah STROUP	Wife	F	M	W	46	PA	Keeping House	PA	PA
Jacob STROUP	Son	M	S	W	17	PA	Works On Farm	PA	PA
Daniel STROUP	Son	M	S	W	15	PA	Works On Farm	PA	PA
Emma STROUP	Dau	F	S	W	9	PA		PA	PA
Jonathan STROUP	Son	M	S	W	12	PA	Works On Farm	PA	PA

Presumably, Jonathan is out of order accidentally.  If Jonathan is deliberately listed last, we need to rethink his relationship to our subjects.

5.  Archives of the STRAUB-L and STROUP-L mailing lists (online at RootsWeb.com).

6.  Emails from Susan M. (Gates) Davis.

7.  Emails from Jim Burnell.