Grok worked well once I had enough information to form a cogent question.
McGuffey’s Eclectic Primer (or simply McGuffey Eclectic Primer) — introductory level, often for pre-K to grade 1.
McGuffey’s First Eclectic Reader (or McGuffey’s Eclectic First Reader).
McGuffey’s Second Eclectic Reader (or McGuffey’s Eclectic Second Reader).
McGuffey’s Third Eclectic Reader (or McGuffey’s Eclectic Third Reader).
McGuffey’s Fourth Eclectic Reader (or McGuffey’s Eclectic Fourth Reader).
McGuffey’s Fifth Eclectic Reader (or McGuffey’s Eclectic Fifth Reader).
McGuffey’s Sixth Eclectic Reader (or McGuffey’s Eclectic Sixth Reader).
As luck would have it the entire collection is at Gutenberg. https://www.gutenberg.org/ebooks/author/5671
In this instance the titles were simple enough and basically incremental in their titling. That is not always the case.
Ok, so update. It has been accepted and McGuffeys will become audio books for all seven as a compiled “McGuffey Readers” series.
One thing to note is that several of the later books in the series are not simple reading items to teach phonics and the alphabet, but contain poetry and also a series of short works by important authors including Blackstone, Edgar Allen Poe, Patrick Henry, and Shakespeare.
As such McGuffey’s Readers are a high value education item to have as audio; having it as text only is clearly a deficient situation. Especially since taken together it looks like there might be 1500 pages or more of material, so its a lot.
It is good that we can resolve this problem. Somebody WILL want this.