| Reference | {Deposit:: BETHANY FALLS LIMESTONE OF SWOPE FORMATION}{Deposit:: IOWA DOT GEN AGGREGATE SOURCE INFO 1981}{Deposit:: USBM 1981 RESPONDENT CONTROL FILE}{Deposit:: IOWA ST HWY COMM AGGREGATE RESOURCE LISTING 1977}{Deposit:: IOWA GEOL SURVEY 1896 ANNUAL REPORT VOL 7, P 529}{Deposit:: IOWA GEOL SURVEY 1906 ANNUAL REPORT VOL 17, P 504} |