For those interested, here is a short list I compiled of the earliest English-language books on Chinese Martial Arts. If you know of more, please contribute!

"Fighting Arts of the Orient: Elemental Karate and Kung Fu" by Kein H. Lee (James Y. Lee) - 1958
"Chinese Karate Kung Fu: Original Sil Lum System" by T.Y. Wong & K.H. Lee -1961
"Tai Chi Chuan: Body and Mind in Harmony" by Sophia Delaza -1961
"Modern Kung Fu Karate: Iron & Poison Hand Training" by K.H. Lee -1962
"Chinese Kung Fu: Original Sil Lum System" (Book 2) by T.Y. Wong -1962
"Chinese Gung Fu: Philosophical Art of Self Defense" by Bruce Lee -1963
"Tai Chi for Health" by Edward Maisel -1963
"Secrets of Chinese Karate" by Ed Parker -1963
"Secrets of Shaolin Temple Boxing" by Robert Smith -1964