The 15-dollar denomination period began in 1991 with Nancy Howe's image of King Elders winning the contest. Howe was the first women to have her design used for a Federal Duck Stamp. This period also included several wins for the Hautman family of Minnesota. In 1997 the printing process switched to the intaglio F press, which had a higher printing capacity than the D press. To date, the 15-dollar denomination stamps have raised over $300 million dollars for migratory bird refuges.