Linkit muille sivustoille
- #502 The quest to reduce light pollution and bring stars back to Pittsburgh - The Verge 17.6.2020
- https://www.theverge.com/21286969/stars-astronomy-pittsburgh-city-light-pollution
- valosaaste Pittsburgh
http://kaupunkilinnut.fi/?links=Pittsburgh
Cached: 2026-11-10 12:20:05 GMT