Whoa, not even thirty minutes after I first opened this thread, I stumble on these very same pictures on the photographer's website.
Look!
Surely he has not had them up for very long. There is no way I would not have seen these earlier if they had been on his site a long time. According to a caption, the date was April 5, 1970. Our girl was only 21 years old!
Head over to his ordering page as well. He says you can purchase prints of these. And there may be more than just these four. He says that many of his pictures are not shown on the website.