Shirley Schermer and Fred Finney, OSA No description specified. 1-2 (2 Records) Documents Letter Report: 1991-1992 Phase II Investigation IN Mines of Spain, 13Db17, 13Db18, and 13Db62, Dubuque County (1992) Letter Report: Fall 1991 Archaeological Investigation at Mines of Spain 13Db17,13Db18 and 13Db62. Dubuque County (1992)