Sections 29 & 30, Place: Fayette, Seneca County, New York.
Historical Note: Section 30, given to David, Peter, Jr., and John Whitmer at Fayette, New York, was originally three separate revelations in the Book of Commandments. Among other matters, section 30 called Peter Whitmer, Jr., to accompany Oliver Cowdery on his mission to the Lamanites. Section 30 was first published as chapters 31, 32, and 33 in the Book of Commandments in 1833.
[Cook, Lyndon, Revelations of the Prophet Joseph Smith: A Historical and Biographical Commentary of the Doctrine and Covenants, http://amzn.to/RevelationsofJosephSmith]