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Subjects
Telescopes
✖Remove constraint Subjects: Telescopes
Authors
Brackett, Frederick S. (Frederick Sumner), 1896-1988, author
✖Remove constraint Authors: Brackett, Frederick S. (Frederick Sumner), 1896-1988, author
Authors
Horvath, Steven M., author
✖Remove constraint Authors: Horvath, Steven M., author
Copyright
Public domain
✖Remove constraint Copyright: Public domain