May and Vidal write, "Through his work, Williams is now widely recognised as pivotal in the history of stereoscopic photography, since his stereo cards were the first examples of photographic art for its own sake ever to achieve wide commercial success."[REF] .
There are a number of TR Williams collectors throughout the world, and it is interesting to note that no one person (at the time of this writing) yet owns a complete collection of his known prints [REF].