I discovered there is a Catch-22 in reading a book and taking notes from it.
On one instance, when I read a book, I may hope to sell it, and keep my notes as a remnant. On the other hand, I may want to keep the book, as a reference, which may have some details that weren’t recorded in the notes, for they may have not been important at the time. But sooner or later, from a reference standpoint, those very facts may gain relevance.
So the best resolution to this dilemma, fortunately, is simple. My invertebrate textbook works equally well as a reference as well as an actual college “textbook.”
As a result, I therefore will keep it indefinitely, and always available right on the shelf. Since the first 4 chapters, pun intended, are the backbone of the rest of the book, they are the only chapters needed to be read in order. The rest can be read whenever wanted or needed. Best of all, as discrete units depending universally (for the most part) on the first four “master” chapters, the other chapters can be read individually, without regard to sequence!
There are a number of other textbooks on the subject, which indeed may be better suited to actual semester college courses (which may, or may not, be in my future; I might as well take it if offered and ace it!). But this one is quite a leader in the subject.
So, from sea to shining sea, and everywhere in between, invertebrates are “in!”