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Alphabetical    [«  »]
died 1
difference 2
different 3
difficult 2
difficulty 1
directed 1
direction 5
Frequency    [«  »]
2 determination
2 diameter
2 difference
2 difficult
2 diversity
2 edge
2 eight
Simon Newcomb
Extent of the Universe
IntraText - Concordances

difficult
  Part, §

1 Text,  8 |       of the most delicate and difficult in the whole field of practical
2 Text,  13| brighter stars - becoming very difficult in the case of stars not

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