National Science Foundation
National Science Foundation: Ice Core Facility (Nsf Icf): About Ice Cores
A fantastic resource for learning about how ice cores are collected, the information we can learn from them about Earth's climate history, the types of research being done with them, and how they are stored. Includes lots of videos.
American Geosciences Institute
American Geosciences Institute: How Ice Cores Are Used to Determine Past Climate
Find out how climate scientists use data from ice cores to determine past climate conditions.