G. A. Barnard was recorded in The Daily Exchange, (Baltimore, Maryland)  in an advertisement which ran from November 2, 1858 to May 2, 1859.

Photographs In Oil Colors, Photographs— in India Ink, Photographs—in Water Colors, Photographs—Plain Mammoth Size, Photographs—in every style, Photographs—made every size, Photographic Temple of Art, G. A. Barnard, No. 213 Baltimore street.

There is no listing for G. A. Barnard in Craig’s Daguerreian Registry, or The Directory of Maryland Photographers. 1839-1900 (Ross J. Kelbaugh.)