Here in the printer’s manuscript, Oliver Cowdery initially wrote book (with capitalized B ) rather than the correct books. However, he almost immediately corrected his error by inserting inline the plural s (the level of ink flow is unchanged). This passage parallels the following passage from the King James Bible:
The plural books here in Revelation 20:12 supports Oliver’s virtually immediate correction of 𝓟 to the plural books, the probable reading of 𝓞 (which is not extant here).
Summary: Retain in 2 Nephi 29:11 the plural books, which is consistent with Revelation 20:12.