My 3  free academic ebooks are at:

https://archive.org/details/im-heroes-1st-ebook-plain-cover_20210302

A study of the hero archetype in comic books, science fiction, and screenwriting. Perspectives from youth psychology and fallacies are included.

https://archive.org/details/m-alg-2nd-ebook-cut

A collection of articles posted on my blog site starting in 2014, including some from academic journals starting in 2000. Topics include comic books, literary theory, mathematics, mythology, and semiotics. 

https://archive.org/details/3rd-ebook/mode/2up

Articles posted on my blog site starting in 2021. Topics include Green Lantern comic books, Fermat's Last Theorem, and mathematical physics.