books.google.fr - With the tremendous growth of population in this and neighboring states, there are more collectors than ever before and with the rapidly escalating prices for mineral and fossil specimens in the retail market, there is a great demand for displayable material. It has become necessary for professional...https://books.google.fr/books/about/A_Collector_s_Guide_to_Rock_Mineral_Foss.html?hl=fr&id=t-XvE8DTiW0C&utm_source=gb-gplus-shareA Collector's Guide to Rock, Mineral, & Fossil Localities of Utah
