Rough–Hewn Land – A Geologic Journey from California to the Rocky Mountains Autor Keith Heyer Meldahl 20 oct 2011 Hardback Preț: 322.69 lei 6-8 săpt.
Hard Road West: History and Geology along the Gold Rush Trail Autor Keith Heyer Meldahl 15 sep 2008 Paperback Preț: 133.64 lei 3-5 săpt.