Books by David Helfand

David Helfand

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The Universal Timekeepers

The Universal Timekeepers

Reconstructing History Atom by Atom

David Helfand

Paperback

Published: 2025

13.99 £11.50 18%

The Universal Timekeepers

The Universal Timekeepers

Reconstructing History Atom by Atom

David Helfand

Hardcover

Published: 2023

20.00 £15.60 22%