worked closely with his wife and mother-in-law on a biography of Young. Widtsoe also edited a book containing Young's significant teachings. Widtsoe was also the lead compiler of Gospel Doctrine, a collection of sermons and teachings of LDS Church president Joseph F. Smith. Widtsoe and his wife authored The Word of Wisdom: A Modern Interpretation, a book which advocates the incorporation of healthy eating habits into the Word of Wisdom. Widtsoe wrote A Rational Theology as Taught by the Church of Jesus Christ of Latter-day Saints, which has been cited by later LDS authors such as J. Reuben Clark. He also wrote Evidences and Reconciliations, which was a compilation of his Improvement Era writings, answering common questions on matters of faith. In this work, Widtsoe acknowledges that there are multiple interpretations that Latter-day Saints can hold on certain issues. One example is his explanation of the time involved in the creation of the earth: he indicated that faithful Latter-day Saints could hold the "six-day", "six-thousand-years", or the "undefined-period" interpretations of the creation. Although Widtsoe focused on explaining the rationale for the "undefined-period" interpretation, he did not belittle the other two or state that they were unorthodox. In 1939, Widtsoe published Priesthood and Church Welfare and Priesthood and Church Government. His work, The Message of the Doctrine and Covenants, was edited by son-in-law G. Homer Durham, and published after Widtsoe's death. Widtsoe wrote Seven Claims of the Book of Mormon: A Collection of Evidences with Franklin S. Harris, Jr. Widtsoe wrote a biography of Joseph Smith entitled Joseph Smith: Seeker After Truth Prophet of God. It was published in 1951, and reprinted by Bookcraft in 1957. Widtsoe also wrote Joseph Smith as Scientist: A Contribution to Mormon Philosophy, published by the Young Men's Mutual Improvement Association in 1908. In 1944, his essay, "The Divine Mission of Joseph Smith", was included in Handbook of the Restoration published by Zion's Printing and Publishing Company in Independence, Missouri. Non-religious books by Widtsoe include Dry-Farming: A System of Agriculture for Countries Under a Low Rainfall (New York: MacMillan, 1920) and Dodge's Geography of Utah. Widtsoe wrote two autobiographies. The first, In the Gospel Net, largely focused on his mother's conversion to the LDS Church. The second, In a Sunlit Land, told the story of his later life, and included explanations of his educational philosophy. Hymns Widtsoe wrote the texts to the hymns "Lead Me into