org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Bar magnet resting on a compass board determination method: SHA-1...
org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English A magnet resting on a compass board determination method: SHA-1...
public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. This file has been identified...
