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Cover for Unknown Adventurer · The Lost Book of Undersea Adventure - The Unknown Adventurer (Paperback Book) (2026)

The Lost Book of Undersea Advent... (2026)

Unknown Adventurer

Release June 4, 2026

Cover for Unknown Adventurer · Journey to the Last River - The Unknown Adventurer (Paperback Book) (2026)

Journey to the Last River - The ... (2026)

Unknown Adventurer

Release April 9, 2026

Cover for Unknown Adventurer · The Lost Book of Undersea Adventure - The Unknown Adventurer (Hardcover Book) (2025)

The Lost Book of Undersea Advent... (2025)

Unknown Adventurer

Cover for Unknown Adventurer · The Lost Book of Adventure: from the notebooks of the Unknown Adventurer - The Unknown Adventurer (Paperback Book) [New edition] (2025)

The Lost Book of Adventure: from... (2025)

Unknown Adventurer