From the above sources, we know that Henry was the son of Samuel and Emma (Anthony) Shackford, born in California January 4, 1883. His parents were living in Stanislaus around the time of his birth so we assume that is where he was born.
We find Henry listed with the middle name of Harrison, in the California Voter Registration lists working in North, Stanislaus, California, Tulare, California, and Grayson Precinct, Stanislaus as a laborer and a farmer between 1900 and 1910. We're fairy confident this is the same Henry because he is working on the same farm as his 88 year old grandfather Simone Hoxie Anthony, and his brother Frank Anthony Shackford.
From Henry's death certificate, we know that he died a horrid death - crushed under a runaway wagon in a town where he had only lived for one week. We also learn that he was single and his poor mother who had lost her husband two years earlier was the informant for Henry's death. Tragically she also lost a daughter Lila in a car accident three years later.
CALIFORNIA STATE BOARD OF HEALTH
BUREAU OF VITAL STATISTICS
STANDARD CERTIFICATE OF DEATH
PLACE OF DEATH County of San Joaquin, City of Stockton, Stockton Hospital
FULL NAME Henry Shackford
Color or Race White, Single, Married, Widowed or Divorced Single
Date of Birth Jan 4 1883
Age 28 years 9 months
Occupation Laborer, Farm
Name of Father Samuel Shackford
Birthplace of Father Mass
Maiden Name of Mother Emma Anthony
Birthplace of Mother California
Length of Residence At Place of Death 1 week
In California life
Informant Mrs. Shackford, Visalia
Date of Death Oct. 4, 1911
I Hereby Certify that I took charge of the remains described
above, held an inquest thereon, and from the evidence
obtained by said inquest, find that said deceased came
to hs death on the day stated above.
The Cause of Death was as follows
beneath wagon in a
runaway and being
Signed B. C. Wallace Coroner
Oct 4th, 1911
Place of Burial Rural Cemetery
Date of Burial Oct 6/1, 1911
Undertaker R. C Wallace 135 N. Stanislaus
California, California, County Birth and Death Records, 1849-1994, https://familysearch.org/pal:/MM9.1.1/QV37-DH7H, Henry Shackford, 4 October 1911; digital images, FamilySearch (http://familysearch.org : accessed 23 August 2014).
California "California, Death Index, 1905-1939," index, Ancestry.com (http://www.ancestry.com : accessed 8 October 2013), Samuel Shackford d. 13 Sept 1909.
California, San Joaquin, County Public Library Obituary Index, 1850-1991," card file, digital images, FamilySearch (http://www.familysearch.org : accessed 27 September 2014), DEATHS, Shackford, Henry SDI 10 05 11; 4:2
"California, Voter Registrations, 1900-1968," digital images, Ancestry.com (http://www.ancestry.com : accessed 27 September 2014), No 42, Shackford, Henry H. farmer 25 Chinese Camp; Simon Hoxie Anthony, grandfather, age 88 at the same camp
"California, Voter Registrations, 1900-1968," digital images, Ancestry.com (http://www.ancestry.com : accessed 27 September 2014), No 96, Shackford, Henry Harrison, age 28, Laborer, address Westley (Image 261 of 840); find the 1910 date on image 250 of 840
Find A Grave, Find A Grave, digital images (http://www.findagrave.com : accessed 18 July 2014), Henry Shackford, Find A Grave Memorial# 69260744