WWVB NIST Radio Time Receiver Kit - WRL-10060 - SparkFun Electronics
Time Traveler's Clock: Deciding An Atomic Clock, GPS Signal, Quartz Clock And Marine Chronometer Alone Just Didn't Cut The Mustard, This Inventor Synced Them All Together - Quill & Pad
CANADUINO 60kHz WWVB Atomic Clock Receiver - Compatible with MSF and JJY60: Amazon.com: Industrial & Scientific
Is That an Atomic Clock in Your Pocket?
Make Your Own Atomic Clock | Hackaday
Atomic Pinball Clock | Hackaday
How to Use a Real-time Clock Module with the Arduino - Circuit Basics