Tom Swift and His Giant Telescope

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Tom Swift and His Giant Telescope  (1939) 
by Victor Appleton
Volume 39 in the first Tom Swift series
Tom Swift Cover 1939 unrenewed.jpg
  1. The New Project
  2. Suspicions
  3. An Accident
  4. A Murderous Attempt
  5. In Peril
  6. Tom Drugged!
  7. Deep Sea Diving
  8. Trapped By a Sea Monster
  9. A Robber
  10. Success!
This work is in the public domain in the United States because it was legally published within the United States (or the United Nations Headquarters in New York subject to Section 7 of the United States Headquarters Agreement) before 1964, and copyright was not renewed.
For Class A renewals records (books only) published between 1923 and 1963, check the Stanford Copyright Renewal Database and the Rutgers copyright renewal records.
For other renewal records of publications between 1922 - 1950 see the Pennsylvania copyright records scans.
For all records since 1978, search the U.S. Copyright Office records.

Works published in 1939 would have had to renew their copyright in either 1966 or 1967, i.e. at least 27 years after it was first published / registered but not later than 31 December(31 December) in the 28th year. As it was not renewed, it entered the public domain on 1 January 1968(1 January 1968).