Here are some resources to get you started on Lesson 16. Here is a lesson I like it because it provides historical information on Polly Peck Knight. Joseph attended her funeral the same day he received Section 59. Unfortunately, I cannot figure out who wrote it. And, while I am not a Meridian Magazine kind of guy, I thought this article by Breck England had a pretty thorough exposition of the Sabbath. Feast Upon the Word does a serious verse-by-verse analysis of Section 59 here.
If you know of other good sources, please feel free to post them here.