Here's a book from 1971 I've had. Many of the cartoons are from other countries. The introduction says, “In times of stress and strain, and of rampant insanity, as for instance, now, the truth said in jest brings a note of sanity...Everyone has the experience of thinking something is something, when it is not...”
I've included most of the book in its entirety except cartoons that spread over two pages and ones from THE NEW YORKER. Those you can see over at Cartoon Bank.
I don't know much about John Glashan. I think he was British. He had a couple pieces in NATIONAL LAMPOON and a collection called SPEAK UP, YOU TINY FOOL.
Also from the introduction, “Holy faces the worst fears and, in his cartoons, dissipates them by thumbing his nose.”