Books by David J Helfand

David J Helfand
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Showing 3 distinct works.

	The Universal Timekeepers: Reconstructing History Atom by Atom by David J Helfand, Perry Daniels (reader) 0.00 avg rating — 0 ratings — 2 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
	The Universal Timekeepers: Reconstructing History Atom by Atom by David J Helfand, Perry Daniels (reader) 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
	Rebecca Anne Elson, 1960-1999 (Bulletin of the American Astronomical Society) by David J 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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