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| USGS Map Name | Map Size | Scale | Latitude | Longitude | DRG Filename | View Map | ||||||
| Illiana Heights | 7.5deg x 7.5deg | 1:24,000 | 41.250°N - 41.125°N | 87.625°W - 87.500°W | o41087b5.tif | |||||||
| Illinois City | 7.5deg x 7.5deg | 1:24,000 | 41.500°N - 41.375°N | 91.000°W - 90.875°W | o41090d8.tif | |||||||
| Ina | 7.5deg x 7.5deg | 1:24,000 | 38.250°N - 38.125°N | 89.000°W - 88.875°W | o38088b8.tif | |||||||
| Ina | 15min x 15min | 38.250°N - 38.000°N | 89.000°W - 88.750°W | |||||||||
| Indianapolis | 1deg x 2deg | 1:250,000 | 40.000°N - 39.000°N | 88.000°W - 86.000°W | c39086a1.tif | |||||||
| Indianapolis W | 1deg x 1deg | 40.000°N - 39.000°N | 88.000°W - 87.000°W | |||||||||
| Industry | 7.5deg x 7.5deg | 1:24,000 | 40.375°N - 40.250°N | 90.625°W - 90.500°W | o40090c5.tif | |||||||
| Ipava | 7.5deg x 7.5deg | 1:24,000 | 40.375°N - 40.250°N | 90.375°W - 90.250°W | o40090c3.tif | |||||||
| Irvington | 7.5deg x 7.5deg | 1:24,000 | 38.500°N - 38.375°N | 89.250°W - 89.125°W | o38089d2.tif | |||||||
| Iuka | 7.5deg x 7.5deg | 1:24,000 | 38.625°N - 38.500°N | 88.875°W - 88.750°W | o38088e7.tif | |||||||
| Ivesdale | 7.5deg x 7.5deg | 1:24,000 | 40.000°N - 39.875°N | 88.500°W - 88.375°W | o39088h4.tif |