- n.d.. Early History of the Bahá'í Community in Boston, Massachusetts. Anise Rideout. — Overview of history 1900-1940. Includes early translations of some 2-dozen tablets of Abdu'l-Baha.
- 2016. Guardian's Wartime Travels, The. Harry Liedtke. — Brief chronology of world events 1938-1940 juxtaposed with Shoghi Effendi's travels in 1940, when he...
- 2014. Ameen Rihani and the Unity of Religion: The Politics of Time and the Politics of Eternity. Suheil Badi Bushrui (published as Suheil Bushrui). — Overview of the life and thought of a Lebanese-American writer, intellectual, and political activist...
- 2013-06. Searching for May Maxwell: Bahá'í Millennial Feminism, Transformative Identity and Globalism in the New World Order. Selena M. Crosson. — On forces influencing and shaping womens' roles in early Baha’i culture, 1898-1940. A group of Wes...
- 2004. Trial and Triumph: The Origins of the Bahá'í Faith in Black America. Jerome Green. — Focusing on a period between 1890 and 1940, this work addresses how Black America first encountered ...
- 1986. Bios of Mihraban Rustam Bulbulan and Kaushal Kishore Bhargava. Dipchand Khianra. — "One Kind Deed," a bio of Mihraban Rustam Bulbulan, and "Kaushal Kishore Bhargava: An Appreciation."
- 1984. Heroes of God: History of the Bahá'í Faith in Ecuador, 1940-1979. Helen Bassett Hornby. — First book (in English) on the first four decades of the Faith in Ecuador.
- 1945. Teaching regions of the United States and Canada (1940). Author unknown.
- 1945. Localities where Bahá'ís live (world, 1940). Author unknown.
- 1945. Bahá'í World, The: Volume 09 (1940-1944). National Spiritual Assembly of the Bahá'ís of the United States and Canada, comp. — Periodic volumes that survey the global activities and major achievements of the Faith.
- 1942. Bahá'í World, The: Volume 08 (1938-1940). National Spiritual Assembly of the Bahá'ís of the United States and Canada, comp. — Periodic volumes that survey the global activities and major achievements of the Faith.
- 1940-09-17. Information for Bahá'ís called to fill out the Questionnaire on military duty under the Draft Act 1940. National Spiritual Assembly of the Bahá'ís of the United States. — Summary of grounds for seeking exemption from combatant duty.
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