It’s sometimes difficult to find good information on the net. Lot’s of information, yes, good information is rather more difficult to uncover. And all the more reason for joy when it is found.
Mary Ellen Solt has published her 1968 Concrete Poetry – A World View at UBU.com. From the introduction:
The term “concrete poetry” is now being used to refer to a variety of innovations and experiments following World War II which are revolutionizing the art of the poem on a global scale and enlarging its possibilities for expression and communication. There are now so many kinds of experimental poetry being labeled “concrete” that it is difficult to say what the word means.