books.google.co.il - A fascinating and accessible introduction to the principles ofphysical and historical geology. For the millions who visit them each year, U.S. nationalparklands offer a glittering spectacle of natural wonders. Butbeyond the spectacular scenery, these national treasures have amuch bigger, more awe-inspiring...https://books.google.co.il/books/about/Geology_of_U_S_Parklands.html?hl=iw&id=S0zDQWiFuvkC&utm_source=gb-gplus-shareGeology of U.S. Parklands
