1. Geologic time scale 2020. (2020) Editors: Gradstein, F. M; Ogg, James G (James George), 1952-; Schmitz, Mark D; Ogg, Gabi Record Type: Book Extent: 1 online resource (2 volumes) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. The concise geologic time scale. (2016) Authors: Ogg, James G (James George), 1952-; Ogg, Gabi; Gradstein, F. M Record Type: Book Extent: 1 online resource View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. The geologic time scale 2012. Volume 2 (2012) Other Names: Gradstein, F. M Record Type: Book Extent: 1 online resource (x, 438-1144 pages), illustrations, maps View Content: Available online (eLD content is only available in our Reading Rooms) ↗