Mary Ashton Rice Livermore (1820–1905) joined the war effort with the U.S. Sanitary Commission. Her book is very comprehensive, and attractive artistically for the blakc and white plates, portraits, and eight colored plates of old flags.
The book opens with an extensive description of the Battle Flags. I cannot transcribe it all, but the text is available at Google Books, HERE.
As quoted from Reynolds Historical Library at the University of Alabama at Birmingham:
"Mary Ashton Rice Livermore, a native of Boston, Massachusetts, is one of the most well-known female figures in the Union relief movement. Before the Civil War broke out, Mary had already devoted her life to social, humanitarian and charitable causes. In her early twenties, she worked as a family tutor on a large rural Virginia plantation. In this position, she came face to face with the injustices of slavery and became a staunch abolitionist. During these pre-war years, Mary also became known for her involvement in the temperance movement, which especially thrived after her marriage to fellow temperance supporter and Universalist minister, Daniel Parker Livermore, in 1845. Mrs. Livermore organized a juvenile temperance group, the Cold Water Army, for whom she wrote short stories and read them aloud (Holland ...