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2. Oakdale quadrangle, Pennsylvania : 7.5-minute series
3. Oakfield quadrangle, Wisconsin : 7.5-minute series
4. Oakton quadrangle, Kentucky : 7.5-minute series
5. Observatory Hill quadrangle, Wisconsin : 7.5-minute series
6. Oconomowoc East quadrangle, Wisconsin : 7.5-minute series
7. Oconomowoc West quadrangle, Wisconsin : 7.5-minute series
8. Oconto East quadrangle, Wisconsin : 7.5-minute series
9. Oconto SE quadrangle, Wisconsin : 7.5-minute series
10. Oconto West quadrangle, Wisconsin : 7.5-minute series
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