Soil and Earth Library offers a wealth of free public domain and ‘out of print’ ebooks of classic authors from the natural hygienic, back to nature, mucusless, raw-foodist, organic agriculture, etc. movements. The primary categories are books on radical agriculture, health, personal sovereignty/liberation, and spirituality. Several authors related to Ehret’s work include:

Dr. Julius Hensel–pioneering agriculturalist and chemist. Author of Bread From Stones and Life: Its Foundations and the Means for its Preservation, the latter of which it quoted by Ehret in the Mucusless Diet Healing System.

Bernarr MacFadden–author of over 100 books on natural health and physical culture.

Herbert Shelton–author and advocate for the natural hygienic movement.

Johnny Lovewisdom— author who wrote about diet, health, fruitarianism, natural living, religion and spirituality.

Edmond Bordeaux Szekely–Hungarian philologist/linguist, philosopher, psychologist, and writer on natural living and fasting.