Here the 1906 LDS large-print edition accidentally dropped the definite article the before possession. But since that edition never served as a copytext, the shorter reading has never been transmitted into any subsequent LDS edition. As explained under Alma 52:26, the normal phraseology in the Book of Mormon, as well as in current English, is not to have an article (either a or the) before possession in the phrase “possession of something”. Nonetheless, there are four instances elsewhere in the text of “the possession of something”, where the something is either lands or strong holds (which belong to the same semantic class as cities do). For the list, see under Alma 52:26. The critical text will therefore maintain the definite article the before possession in the phrase “the possession of the city of Nephihah”.
Summary: Maintain in Alma 62:26 the use of the definite article the before possession in “the possession of the city of Nephihah”; although unusual, such usage does occur elsewhere in the text.