1. South Africa
1857. Hall, Henry. Maps show altitude profiles (by inverse fahrenheit scale for boiling of water) for two routes traversed by Gibbon, east to west, and north to south... J.A. Crew (Cape Town).
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2. South Africa
1880. Hall, Henry. Relief shown by hachures.; "Published 1st Jan. 1880."; "With additions and corrections from surveys and explorations to 1878." 40 x 69 centimeters ... Stanford (London).