In regard to the 12 & 21 Oct 1949 cases at Mt. Palomar
Observatory in the NICAP chronology and Sparks' "BB Unknowns" list:
The 25 Nov 1949 "case" in the Blue Book Archive contains some
material on this incident. It is not actually a case file, but a
collection of correspondence related to the potential detection of
atomic powered UFOs by geiger counter equipment, which was put
together in 1952. There are several pages about the events and
witnesses at Mt. Palomar.
The witness on the Blue Book project card is identified as "Focke,"
which is not correct. Focke was neither a UFO witness nor a UFO
reporter. He was Dr. Albert B. Focke, a scientist working on the
cosmic ray detection experiment which was located at Mt. Palomar.
Dr. Focke was chief scientist of the Naval Electronics Laboratory in
San Diego (I don't know if he was such in 1949), and he was later
chief scientist at Point Magu Naval Missile Test Center. I know Dr.
Focke's son, who unfortunately does not know anything about the Mt.
Maxwell Roll #7, page 907-953.
The following PDF for the files 907-953 was constructed by Fran
Ridge for security purposes and the file is now housed on the NICAP