What is the source of finding his photo?

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Nicolas Gerard Co. K, 39th N. Y. Inf., enlisted 4/27/61 age 24

Nicholas Girard
Birth: unknown
Death: Dec. 1, 1915
Burial:
Danville National Cemetery
Danville
Vermilion County
Illinois, USA
Plot: 9, 2181/R2

Find A Grave # 2565411

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William J. Bookless Co. C 65th Ill. Inf.

William J. Bookless was born in February 1850 in Indiana. He married Cynthia
Marinda Leise on November 29, 1872. They had three children during their
marriage. He died on May 16, 1924, in Danville, Illinois, at the age of 74.
Cemetery: Bailey Memorial Cemetery Burial or Cremation Place: Tolono,
Champaign County, Illinois, USA

1880 United States Federal Census

Name: William J . Bookless
Age: 30
Birth Year: abt 1850
Birthplace: Indiana
Home in 1880: Tolono, Champaign, Illinois
Race: White
Gender: Male
Relation to Head of House: Self (Head)
Marital Status: Married
Spouse's Name: C. Marinda Bookless

Find A Grave # 29149828

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Marcena B. Duell Co.D, Illinois 72nd Infantry Residence: Chicago, Cook CO, IL

Illinois, Deaths and Stillbirths Index, 1916-1947

Name: Marcena Eugene Duell
Birth Date: abt 1835
Death Date: 10 Dec 1917
Death Place: Tolono, Champaign, Illinois
Death Age: 82
Gender: Male
Father Name: Nelson Duell
Mother Name: Phebe Moser
FHL Film Number: 1530925

Find A Grave # 80162729

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Finney, G. W. Co. F, 59th ILL. Vol. Inf Died: 1916 Find A Grave # 68244896