O Holtedahl

title	ISBN-13 (ISBN-10)	year of publica- tion	other author(s)
Geological Guide to Oslo and District	978-82-00-06095-6 (82-00-06095-0)	1967	J.A. Dons
Geology of Norway	978-82-00-31208-6 (82-00-31208-9)	1960