I recently covered John Boler’s 1963 book on Pierce and Duns Scotus. Scholastic Realism: A Key to Understanding Pierce’s Philosophy (2018) by Paniel Reyes Cardenas revisits this territory. It benefits from the newer, chronological edition of Pierce’s works that is still being published.
Cardenas argues that Pierce’s interest in Scotus extends across Pierce’s entire career, and provides ample evidence for this, with abundant quotations that I found quite interesting. He says he wants to assert a stronger or broader influence of Scotus on Pierce than the limited one found by Boler.
Nonetheless, he still locates their connection on the realism-nominalism axis. Several pages are devoted entirely to Scotus, mentioning basic themes like haeccity and univocity. But although he gives a richer picture of Pierce, Cardenas ultimately has less to say about Scotus than Boler did. Boler was also a Scotus scholar, and published quite a few other articles entirely devoted to Scotus.
The Postmodern Peripatetic 