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| Event | Monarch PEAK Migration |
| Date of Sighting | 10/18/01 |
| Comments | El 18 de octubre observe el paso de las mariposas a 50 Kilometros al este de la ciudad de San Luis Potosi por la carretera a Rio Verde. Pasaban un promedio de 6 mariposas por minuto.
Contributed by Correo Real. |
| Location | Rio Verde |
| State/Province | SLP |
| Latitude | 22.00 |
| Longitude | -100.00 |
| email this observer (----@mcsa.net.mx) | |
| Observer's First Name | Jorge |
| Observer's Last Name | Sanchez |
| Teacher's First Name | |
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| Grade | |
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| City | San Luis Potosi |
| State/Province | SLP |
| Country |
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