Lake Creek Township, Calhoun County, Iowa.
The connection to the Brassfield surname is Clara Ross is my Great Grandmother. Her daughter married Elvis J. Brassfield.
Other surnames in this photo are Vadakin, Moore, Hiler, Heath, Rosenberg, Clark, Waugh, Savage, Gregg, Willert and Cleland.
Here is an approximate transcription of the caption. Unfortunately they are not listed in the order they are photographed. I would imagine most of these names also appear in the Lake Creek, Calhoun, Iowa census for 1900.
John Vadakin, Agnes Vadakin, Richard Moore, Bessie Hiler, Vernie Hiler, Grace Hiler, Etta Hiler, George Ross, Mason Ross, Mary Ross, Clara Ross, Lee Heath, Earl Heath, Fred Rosenberg, Bernice Rosenberg, Jern? Rosenberg, George Clark, Louisa Clark, Merle Clark, Stella Clark, Bessie Waugh, Willie Waugh, Frank Waugh, Bill Acklin, Mary Acklin, Ruth Acklin, Carl Savage, Lola Greg, Ethel Greg, Curt Greg, Paul Greg, Ruby Willert, Emma Willert, Celia Cleland, Florence Cleland.