MSHA INSP FORM GIVES LOCATION AS 2 MILES SW OF MASON CITYIOWA DOT GIVES LOCATION AS NE OF NW SEC 8 AND S2 OF SW SEC 51981 EXTENT MAY INCLUDE ADJACENT PITS IN SEC 16 AND 17MSHA 1981 METAL-NONMETAL MINE FILE REFIOWA DOT COUNTY MINE LOCATION BOOK IGS FILESMSHA MINE INSPECTION FORM NO 1 INSP DATE 5-26-81