Books by David Helfand

David Helfand
Average rating 3.68 · 31 ratings · 6 reviews · shelved 139 times

Showing 2 distinct works.

	The Universal Timekeepers: Reconstructing History Atom by Atom by David Helfand 3.68 avg rating — 31 ratings — 3 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Career Change by David Helfand 0.00 avg rating — 0 ratings	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars

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