Public domain. Cover image from Project Gutenberg ebook #74086. The invisible master auctore Edmond Hamilton Detrahe .m4b · 80 MB Quomodo audiendum → · Problema cum hac recitatione? Animadversionem mitte → Recitator Walter — American Narrator (en-US) Diuturnitas 1 hr 18 min Lingua English Additum November 3, 2026 Liber electronicus originalis Project Gutenberg Licentia Public domain FictionMysteryScience Fiction