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- [21] Continued performance and economic issues for the polk County Minnesota bituminous county road constructed with municipal solid waste combustor ash NAWTEC11: PROCEEDINGS OF THE 11TH ANNUAL NORTH AMERICAN WASTE TO ENERGY CONFERENCE, 2003, : 231 - 240
- [25] Responses to Landslides and Landslide Mapping on the Blue Ridge Escarpment, Polk County, North Carolina, USA ENVIRONMENTAL & ENGINEERING GEOSCIENCE, 2022, 28 (01): : 25 - 54
- [28] "There Are Not Many Colored People Here": African Americans in Polk County, Arkansas, 1896-1937 ARKANSAS HISTORICAL QUARTERLY, 2011, 70 (04): : 429 - 449
- [30] Water Quality Monitoring of Five Karst Springs within a Pastureland in Southwest Polk County, Missouri ENVIRONMENTAL & ENGINEERING GEOSCIENCE, 2022, 28 (04): : 387 - 396