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P M Sheehan
P M Sheehan is the author of "The Late Ordovician and Silurian of the Eastern Great Basin" and "The Upper Ordovician Through Middle Silurian of the Eastern Great Basin".
Books by P M Sheehan
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The Upper Ordovic...
Budge, D. R.
Hardback:
$5.50
The Upper Ordovic...
Budge, D. R.
Hardback:
$2.50
The Late Ordovici...
Sheehan, P. M.
Hardback:
$2.25