Title: Dannelsen af jordskorpens bjergarter og malmforekomster
Description: Accidentally, I found the reference to this booklet on Open Library pages on www. The author is me. As a teacher in geology, I used the booklet as basic stuff in education in fundamental course modules in science and geography. It took place in a period of more than twenty years in Roskilde University, Denmark. Language is danish, no english abstract. The booklet was continuously improved and latest edition is available as pdf elsewhere on www.