A photo from an antique store in Tucson. There is no studio mark. A woman is surrounded by four women and girls and six men and boys. Almost certainly a family portrait.

On the back: 

Elmers Mother & family (Julius Liebig family.)

Mrs. Julius Leibig Frankfort SD

(below that is instructions on editing the photograph)

IDENTIFICATION

On Ancestry I searched in the All Records portion "Julius Leibig." Seven entries came up. The third one was for the 1900 census and listed a Julius A. Leitrr of Frankfort, Spink County, South Dakota. Someone had corrected the index to Julius A. Leibig.

The entry lists the following members of the family:

LEIBIG, Minnie Head Oct 1832 Germany She had been the mother of 13 children, 8 were still alive

LEIBIG, Julius A. Son Feb. 1880 Wisconsin

LEIBIG Richard O. Son Oct 1883 Wisconsin

LEIBIG, Minnie L. Daughter Sept 1886 South Dakota

LEIBIG William C. Son Sept. 1889 South Dakota

LEIBIG, Matilda M. Daughter Mch 1891 South Dakota

LEIBIG, Elmer R. Son Nov 1894 South Dakota

(Minnie Leibig household, 1900 US census, Spink County, South Dakota, population schedule, Frankfort, ED 307, SD 2, sheet 4A, dwelling 77, family 77).

The woman seated third from left is Minnie Leibig. She is surrounded by 10 individuals, likely all of her surviving children.

Julius's tombstone on Findagrave (Memorial 82134602) lists his surname as LIEBIG. His obituary is also posted on the website:

Funeral Services For Julius Liebig.

    FRANKFORT, July 27.- (Special) - Funeral services were to be held here this afternoon for Julius Liebig, 49, who died at home in Frankfort Monday after a long illness. He had been suffering from cancer for more than a year. Services were to be held at the home, and burial was to be in the Mount Hope cemetery.

    Surviving are his wife and four children, Perry Liebig of Frankfort, Mrs. Ray Houten of Rapid City, Oner Liebig of Frankfort and Arlene Jones of Frankfort. He also leaves four sisters, Mrs. W. F. Nork of Redfield, who was here at the time of his death; Mrs. August Blank of Tualatin, Ore.; Mrs. John Marlin of, Boisserain, Manitoba, Canada; and Mrs. Charles Delaware of Aberdeen.

    Brothers who survive are Albert of Hemit, California; Robert of Doland, and Richard, William and Elmer of Faulkton.

    Mr. Liebig farmed in the vicinity of Frankfort for a number of years, later moving in to town where he operated a filling station. He was a member of the I.O.O.F. lodge.

There are 20 other Liebigs buried in the Frankfort Cemetery including his parents, Julius and Minna.

Ancestry shows that Minna (Swartz) Liebig (1852-1911) was the mother of 10 children. I have been able to determine who seven of them are in the photo.

HELVENA b. 1874. She is the oldest daughter and is probably the woman seated on the right side of her mother.

ALBERT  b. 1876. he is the oldest son. A photo of him with a mustache is posted on Ancestry. He is the man third from left in the photo.

EMMA b. 1877. She is the second oldest daughter and is the woman seated second from the left.

ROBERT b. 1877

JULIUS b. 1880

RICHARD b. 1883

MINNIE b. 1886 Her photo is posted on Findagrave (Memorial 47703926). In the above photo she is seated first on the left.

WILLIAM b. 1889. He is the second youngest son and is standing on the far right.

MATILDA b. 1891. She is the youngest daughter, and is the girl standing on the left in the photo.

ELMER b. 1894. His photo is posted on Findagrave (Memorial 157001629_. In the above photo he is seated on the far right.

The three other sons are probably Richard (back row left), Julius (back row second from right), and Robert, second from left back row), but I am uncertain.

How did the photo end up in Tucson? Son Elmer died and is buried here (Findagrave Memorial 157001629).