Blue Book Special Report No. 14 (1955).
documentedgovernment_studyPrivate Aerospace Contractors
Battelle's punch-card statistical analysis of ~3,200 UFO cases for Project Blue Book; published 1954/55.
A genuine, declassified Air Force document — the largest statistical UFO study ever undertaken. Battelle analysts sorted cases into knowns, unknowns, and insufficient-information, using IBM punch cards. Battelle kept its name quiet to avoid UFO association. Internet Archive hosts the full text.