| item | description | category | filter | more on... |
| CTRR | Chisholm Trail RailRoad Company | Regional/Railroads |
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| CTRR | Cloquet Terminal RailRoad | Regional/Railroads |
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| CTRR | Coffee Time Reviewer Read award | Misc/Awards & Medals |
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| CTRR | Cumbres & Toltec Scenic RailRoad | Regional/Railroads |
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| CTRR | Current Topics in Radiation Research | Edu./Conferences |
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| CTRR | Customer Trouble Report Rate | Business/General |
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