if the articles from the 60s have not been posted on the net, then nobody can look them up. If Roddenberry's presentation at Ohio State is not on the internet, does that mean I was not really there to listen to him live? On another site I was going to mention a childhood memory about Expo 67, but since my family stayed with relatives (and I was 7), I don't have any hotel receipts to prove I was there. Does this mean that any memories are invalid?....
I think that it is possible that various indexes to magazine and fanzines might sometimes include the contents of each issue.
for example: Here is link to a page about the February, 1968 issue of
Analog Science Fiction Science Fact:
http://www.isfdb.org/cgi-bin/pl.cgi?56790
This page doesn't post the text of the stories and articles in the issue, but it does post a table of contents. The table of contents does list an article by G. Harry Stine: "To Make a Star Trek" on pp. 70-86. So that tells you that a particular issue of
Analog, the February, 1968, issue, has an article about
Star Trek. Then you can try looking for the February 1968 issue of
Analog in a large library, or online, or create a post somewhere asking for science fiction fans who have copies of that issue to see if the article mentions the subject you are interested in.
Because I was a little familiar with looking up things like this, and I remember a little bit about that article by G. Harry Stine. I google G. Harry Stine, and got his wikipedia article here:
https://en.wikipedia.org/wiki/G._Harry_Stine
And then I quickly scrolled down to the bottom, the section called External Links, and clicked on the link to G. Harry Stine's section in the Internet Speculative Fiction Database here:
http://www.isfdb.org/cgi-bin/ea.cgi?892
And then I quickly scrolled down to Essay Series, Science Fact Analog, and found the article listed and clicked on it to get to the page with the table of contents:
http://www.isfdb.org/cgi-bin/pl.cgi?56790
It took me a lot less time to find it than to write about how I found it and possibly less time than it took to read about the search.
I think that the Internet Speculative Fiction Database should be a good place to search for articles about
Star Trek published in various science fiction magazines between 1966 and 1969, or between 1964 and 1972, or whatever date range seems best to search.
And there may be similar methods to search for articles about
Star Trek in
TV Guide and other television magazines. I know that there used to be printed indexes to articles in many magazines in a specific time period. And there might be similar methods to search for articles about
Star Trek in entertainment industry magazines like
Variety.
As I remember, within the last year or two there was mention in one of the forums here of a list of all the early
Star Trek fanzines from the 1960s. So that discussion seems like a good place to start looking for the articles you remember if they were in fanzines.