I want to know the answer to the following question:
How was the first listing limited in what species were listed?
All the background I'm provided with is that "This first list is referred to as the "Class of '67" in The Endangered Species Act at Thirty, Volume 1, which concludes that habitat destruction, the biggest threat to those 78 species, is still the same threat to the currently listed species.". Is that enough to answer the question?
Answer: no