Some first thoughts
Newspapers
gov reports
legal materials
popular media
accounts
contemporary publications
images
interviews
Tips
Examples:
For Newswires, NexisUni is a good place to look.
For example, this is a good place to search some of those earlier search terms from the original document like Ocean Springs AND UFO
Type of report will dictate where you look.
The best go-to NexisUni, which has law journals, court cases, admin codes, admin materials, and newswires.
Example search brings up really weird results.
I may want to omit UFO or "unidentified flying objects" and look at the admin material
In WorldCat, use ("personal narratives" OR letters OR biograph* OR autobiograph* OR diaries OR letters OR interview*) to find interviews or diaries
Limit 1965-1975 and nonfiction
Try search (UFO* OR "unidentified flying objects" OR extraterrestrial* OR "Flying saucers" OR "Alien life" OR "alien lifeforms") AND ("personal narratives" OR letters OR biograph* OR autobiograph* OR diaries OR letters OR interview*)
Newspapers
Look up the names of individuals who have report abductions, or use a basic search like UFO* AND interview* in a newspaper database, limited to 1965-1975 (ex) in newspapers.com
Use "document type" feature in databases to limit to images.
Use Image databases like ArtStor or AP Image Collection
Go into our biggest databases, narrow to 1965-1975, search (UFO* OR "unidentified flying objects" OR extraterrestrial* OR "Flying saucers" OR "Alien life" OR "alien lifeforms") and see what happens.
Ex EBSCO