The Unity of the Spirit ; Proceedings and Papers of the First Congress of the National Federation of Religious Liberals, Held at Philadelphia, Penn., in the Meeting House of the Religious Society of Friends, April 27, 28, 29, and 30, 1909 ;

The Unity of the Spirit ; Proceedings and Papers of the First Congress of the National Federation of Religious Liberals, Held at Philadelphia, Penn., in the Meeting House of the Religious Society of Friends, April 27, 28, 29, and 30, 1909 ;