615 citations · 1k across the 5 of their papers we have counts for
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N. Zacharias, M. I. Zacharias, G. G. Douglass +1
A first version of the Twin Astrographic Catalog (TAC) of positions for 705,679 stars within −18∘≤δ≤90∘ has been produced. The sky coverage of the TAC is com…