It's an interesting debate in notation. Not all log notations show the base, as they mostly assume you know which base you are in (even/especially in the slide rule era, to my understanding, where the base was always assumed by the slide rule in use; which stories posit was fun when mathematicians would default to natural log slide rules and engineers to base-10 log).

This article would be better if showed the base in its notation, but for the most part the bases are determinant in context of each paragraph, and that's roughly par for the slide rule course.