{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Pre-Cambrian igneous rocks of the Unkar terrane, Grand Canyon of the Colorado, Arizona","author_name":"Charles D. Walcott","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3QC/bigB003QCJ3C0.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003QCJ3C0.html\">Pre-Cambrian igneous rocks of the Unkar terrane, Grand Canyon of the Colorado, Arizona</a>","width":400,"height":300}