Public domain. Cover image from Project Gutenberg ebook #71592. Survival factor auctore Charles V. De Vet Detrahe .m4b · 34 MB Quomodo audiendum → · Problema cum hac recitatione? Animadversionem mitte → Recitator Arthur — English RP Narrator (en-GB) Diuturnitas 34 min Lingua English Additum November 5, 2026 Liber electronicus originalis Project Gutenberg Licentia Public domain FictionScience Fiction