Challenge Unknown (117 results)

Paperback. Condition: Very Good. 2. It's a well-cared-for item that has seen limited use. The item may show minor signs of wear. All the text is legible, with all pages included. It may have slight markings and/or highlighting. Graham, Garth Cameron (illustrator).

mass_market. Condition: Very Good. Connecting readers with great books since 1972! Used books may not include companion materials, and may have some shelf wear or limited writing. We ship orders daily and Customer Service is our top priority. Gray Morrow (illustrator).

mass_market. Condition: Good. Connecting readers with great books since 1972! Used books may not include companion materials, and may have some shelf wear or limited writing. We ship orders daily and Customer Service is our top priority. Gray Morrow (illustrator).

mass_market. Condition: Good. Connecting readers with great books since 1972! Used books may not include companion materials, and may have some shelf wear or limited writing. We ship orders daily and Customer Service is our top priority. Gray Morrow (illustrator).

Condition: Very Good. 1st. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

Condition: very_good. Gently read. May have name of previous ownership, or ex-library edition. Binding tight; spine straight and smooth, with no creasing; covers clean and crisp. Minimal signs of handling or shelving. 100% GUARANTEE! Shipped with delivery confirmation, if you're not satisfied with purchase please return item! Ships USPS Media Mail.…

paperback. Condition: Good. Some light wear Satisfaction 100% guaranteed.

Condition: Very Good. 1st. Former library copy. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.…

Condition: Good. New York: Ace Books, 1973. Book 32. 16mo mass market paperback. Good book. Inquire if you need further information.

Soft cover. Condition: Good Plus. Softcover. Good plus condition with light edge and cover wear.

Mass Market Paperback. Condition: Very Good. First Thus. Gray Morrow (illustrator).

Soft cover. Condition: Good. Paperback. Good condition. Light soiling to covers and edges. Moderate creasing to spine and covers.

Mass Market Paperback. Condition: Very Good-. First Edition. 1st printing, Oct. 1973; #66015. Cover art by Gray Morrow. Part 1 of "Cosmos". Paperback original. Creasing; soiling; bumps and dings. Book.

Mass Market Paperback. Condition: Very Good. First Edition. 1st printing, Oct. 1973; #66015. Cover art by Gray Morrow. Part 1 of "Cosmos". Paperback original. Stress; a little roll. Book.

paperback. Condition: Very Good. Connecting readers with great books since 1972! Used books may not include companion materials, and may have some shelf wear or limited writing. We ship orders daily and Customer Service is our top priority.

Hardcover. Condition: Very Good. Condition: Used - Very Good. Hardcover edition.

Paperback. Condition: Fair. No Jacket. Readable copy. Pages may have considerable notes/highlighting. ~ ThriftBooks: Read More, Spend Less.

Paperback. Condition: Fair. No Jacket. Readable copy. Pages may have considerable notes/highlighting. ~ ThriftBooks: Read More, Spend Less.

Paperback. first edition. good paperback.

Paperback. Condition: Good. First printing. Pages clean; binding tight; minor wear to covers. 160 pages. Detailed cover scans available upon request. We also carry other volumes in this series. Size: 4.25" x 7". Gray Morrow (illustrator).

Paperback. first edition. very good , creases paperback.

Paperback. first edition. very good -fine, reading crease paperback.

Soft cover. Condition: Good. First edition UK paperback, 1978 Orbit. The book is in good condition.

Condition: Good. DJ. In touch with the ever-growing mass of manifestations of the occult, Anspacher has plumbed the past as well as the present for scientific evidence of psychic phenomena. Introduction by Waldemar Kaempffert. Hard Cover.

Condition: Very Good. Dust Jacket Condition: 8090574. 1791375392. 10/7/2026 12:16:32 PM.

Condition: New.

Paperback or Softback. Condition: New. Whatever Happened to that Little Foreign Girl?: A Story of Adventure Under the Southern Cross. It's the challenge of the unknown that keeps it interes. Book.

Paperback or Softback. Condition: New. Archimedes' Revenge: The Challenge of the Unknown. Book.

Condition: Very Good. Very Good condition. No Dust Jacket In protective mylar cover. (voyages and travels, explorers, adventure and adventurers ) A copy that may have a few cosmetic defects. May also contain light spine creasing or a few markings such as an owner's name, short gifter's inscription or light stamp. Bundled media such as CDs, DVDs, floppy disks or access codes may not be included.…

Paperback. first edition. almost near fine, unread paperback.