Yes. From Mulholland's column, I think, for June 1936.
Hardeen wrote the following interesting letter to me: "The very beautiful story about the card throwing of Herrmann and Thurston in the May issue interested me very much. However I think that it is a little incomplete in not mentioning the name of Houdini. In 1894, when Houdini and I were performing as the Houdini Brothers, Houdini threw out steamboat cards with his picture on the front. These were the regular cards, no thicker. Then when Houdini joined the Welsh Brothers tent show, after his marriage, and worked the act under the name of Harry and Bessie Houdini, Jim Bard of the famous Bard Brothers (Jim and Eddy) taught him how to do a back somersault. After that Houdini would scale out the cards and (he last card, he would throw out, turn a back somersault and catch as it returned to the ring."