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20181207_46pwirtanen_stack_b

Published by John A. Blackwell

Director of Phillips Exeter Academy Grainger Observatory, research astronomer, astronomy & education consultant. View all posts by John A. Blackwell

December 8, 2018

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20181207_46pwirtanen_stack_b

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John A. Blackwell, B.S., M.S., F.R.A.S.

John A. Blackwell, B.S., M.S., F.R.A.S.