Archives
Approximately 303 episodes of the original series were made. There are records of 238 episodes, and kinescope films from 186 episodes, stored in Special Collections of the Milton Eisenhower Library at Johns Hopkins University. This means it has the most surviving episodes of any DuMont Network program. The earliest surviving kinescope is from November 21, 1950. At least three episodes survive at the UCLA Film and Television Archive.
In addition, Johns Hopkins University has records and films of the three successor series.
Read more about this topic: The Johns Hopkins Science Review