Author: Yearning K. Chen
Bio: "T'ai Chi Ch'uan Its Effects and Practical Applications" by Yearning K. Chen was originally published in hard cover - printed by: 
SUN WAH PRINTING CO.
15-17, Lai On Lane, Sai Ying Pun,
Hong Kong
This book does not have any publishing date on its copyright page or elsewhere, but I have seen references to this book indicating 1947 as its release date.