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| Discount | Details | Validity |
|---|---|---|
| 50%Off | Save Up To 50% On Friends Of Mcdonald At Mcdonald Observatory | 30-7-26 |
| 50%Off | Save More: Help Renovate Mcdonald Observatory Visitors Center Up To 50% Off | 31-7-26 |
| 30%Off | Save 30% On Field Trips At Mcdonald Observatory | 29-7-26 |
| $100Off | Teacher Workshops Now As Low As $100 | 23-7-26 |
| $15Off | Dark Skies Initiative From $15.4 | 31-7-26 |
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