The threshold of the unknown region

by Sir Clements R. Markham

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Availability Report

Audible
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Google Play Books
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Apple Books
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Kobo
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OverDrive
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Hoopla
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Libby
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Public Domain Availability/Unknown Format
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The Threshold of the Unknown Region: Searches across major official audiobook retailers (Audible, Google Play Books, Apple Books, Kobo) and library platforms (OverDrive, Hoopla, Libby) did not yield a listing for an official, professionally produced audiobook. Given the book's publication date (1873), it is in the public domain, meaning free, likely narrator-read audiobooks may exist on platforms like LibriVox or YouTube, but these are not confirmed as official or unabridged versions provided by a standard retailer or publisher.

Summary

A thorough search across Audible, Google Play Books, Apple Books, Kobo, OverDrive, Hoopla, and Libby for an official, unabridged audiobook of "The Threshold of the Unknown Region" by Sir Clements R. Markham did not result in a confirmed listing. The book was published in 1873 and is in the public domain, which suggests that while free audio recordings may exist on platforms outside the specified official retail/library list (such as LibriVox or YouTube), no paid or officially distributed version from a major platform was found to be currently available. Therefore, the official audiobook is considered unavailable based on the specified criteria.