1.  Marriage Record:

2.  1880 Census Every-Name-Index/Images (online at Ancestry.com):  Julius GUICHART (æ 11/12, b. July) is living in Charlotte Town[ship], Chautauqua Co., NY, with his parents (q.v.).  Ardalla R. ROSE (æ 3, b. PA) is living in Beaver Twp., Clarion Co., PA, with her parents (q.v.).

3.  1890 Census:  the 1890 Census Population Schedules were destroyed.

4a.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #29 of 29):  Charlotte Twp., Chautauqua Co., NY, Roll T623_1013, p. 65A, SN 15, SD 16, ED 77, enumerated 30 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
377	391	Guichard Julius	Head	W	M	Aug 1879	20	M	0			NY	France	France	Day Laborer	0	Y	Y	Y	R	H
		________ Lillian	Wife	W	F	Feb 1882	18	M	0	0	0	NY	NY	NY			Y	Y	Y

4b.  1900 Census Every-Name-Index/Images (online at Ancestry.com):  Della ROSE (æ 22, b. Jan 1877, PA) is living in Kane, McKean Co., PA, with her widowed father and two HEARST children (q.v.).  I have no explanation, beyond enumerator error, for the fact that she isn't surnamed HEARST and labeled a widow.

5a.  1910 Census Every-Name-Index/Images (online at Ancestry.com, Image #12 of 20):  121 East 2nd Street, City of Jamestown (Ward 1), Chautauqua Co., PA, Roll T624_930, p. 6B, SN 6B, SD 20, ED 144, enumerated 20 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	12	13	14	17	18	19	20	23	24
*	121	107	150	Guichard Julius	roomer	M	W	30	S	Can. French	Can. French	Can. French	Eng	contracter	carpenting	Emp	Y	Y
*East 2nd Street

One of several roomers in a hotel.

5b.  1910 Census Every-Name-Index/Images (online at Ancestry.com):  can't find Della.

6.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #6 of 40):  43 Davis Street, Bradford City (Ward 4), McKean Co., PA, Roll T625_1600, p. 106B, SN 3B, SD 15, ED 121, 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).
1	2	3	4	5	6	7	9	10	11	12	17	18	19	21	22	23	24	25	26	27	28
*	43	36	69	Guichard Julius	Head	R	M	W	40	M	Y	Y	NY	France	French	France	French	Y	Carpenter	House	W
				________ Della	Wife		F	W	42	M	Y	Y	PA	PA		PA		Y	none
*Davis Street

7.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #54 of 73):  43 Lincoln Ave., Bradford City (Ward 6), McKean Co., PA, Roll 2079, p. 190A, SN 27A, ED 42-10, SD 3, enumerated 1 May 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	2	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	24	25	26	27	28	30
*	43	Guichard Julius	Head	R	Un	R	N	M	W	50	M	32	N	Y	NY	FRA	FRA	Y	Carpenter	House	W	Y	N
		________ Della	Wife					F	W	52	M	34	N	Y	PA	VT	PA	Y	None
*Lincoln Ave

This entry was tacked on to a half-empty page, without visitation numbers, as if it had been missed; and it appears is was because Della's sister, Cora Blanch (ROSE) BOGGS, and her husband are living at the same street address (q.v.).

8.  World War I Selective Service System Draft Registration Cards, 1917-1918.  Microfilm Series M1509 (4277 rolls), National Archives and Records Administration, Washington, DC (card images and index online at Ancestry.com):

Roll | Serial No. | Order No:	1894016 | 2736 | 1717
Name:	Julius Forest Guichard
Permanent Home Address:	43 Lincoln Ave Bradford Pa
Age in Years | Date of Birth:	37 | July 30 1879
Race:	White
U.S. Citizen:	Native Born
Present Occupation:	Carpenter
Employer's Name:	[unreadable]
Place of Employment:	Bradford Pa
Nearest Relative: Name:	Mrs Della Guichard (wife)
Nearest Relative: Address:	Bradford Pa
Signature:	J. F. Guichard
Height (tall, medium, short):	Medium
Build (slender, medium, stout):	Slender
Color of Eyes | Color of Hair:	Brown | ?? Brown
Physically Disabled:	Left hand been badly cut
Date of Registration:	Sep 10 1918
Draft Board:	LOCAL BOARD, LAFAYETTE CO. MO., LEXINGTON, MO.

The card is rubber stamped with the draft board name.  He's indexed as being registered in McKean County, which is surely correct, so why the MO stamp?  Were they traveling in Missouri on the deadline for registration?

9.  U.S. Selective Service System.  Registration Cards, World War II, 1942.  NARA, Washington, DC (online at Ancestry.com):

Microfilm Roll | Serial No. | Order No:		WW2_2240343 | 64 |
1	Name:	Julius Forrest Guichard
2	Place of Residence:	Tuna Foster twp McKean Pa
3	Mailing Address:	RD#2 Bradford, Pa
4	Telephone (Exchange | Number):
5	Age in Years | Date of Birth:	63 | July 30 1879
6	Place of Birth:	Charalotte, N.Y.
7	Name and Address of Person Who Will Always Know Your Address	Mrs Della Guichard Bradford, Pa RD#2
8	Employer's Name and Address:	disabled
9	Place of Employment of Business:
10	Registrant's Signature:	Julius F. Guichard
[back side of card — image currently unavailable]
11	What military service have you had?	-
12	Do you claim exemption from draft?	-
Signature:		-
Height | Weight:		- | -
Race | Complexion:		- | -
Eyes | Hair:		- | -
Date of Registration:		-
Draft Board:		-

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