Originally, this document was fully denied under FOIA Exemption (b)(1), in June of 2016.
I appealed, based on the reality that the record was nearly 50 years old (at the time of requesting) and it seemed pretty unbelievable that not a single page was releasable.
My appeal was partially granted, and 14 out of the 241 pages were released.
According to the document:
“The purpose of the work undertaken was to provide an improved means of disseminating dry biological agents from high-performance aircraft. “
Improved Dry Biological Disseminator, June 1967 [15 Pages, 1.1MB]