Public domain. Cover image from Project Gutenberg ebook #68730. Exploration Team auctore Murray Leinster Detrahe .m4b · 106 MB Quomodo audiendum → · Problema cum hac recitatione? Animadversionem mitte → Recitator Walter — American Narrator (en-US) Diuturnitas 1 hr 43 min Lingua English Additum November 7, 2026 Liber electronicus originalis Project Gutenberg Licentia Public domain FictionScience Fiction