https://creativecommons.org/publicdomain/zero/1.0/ https://www.rawpixel.com/image/378040 Hill shading guideline from Draughtsman's Alphabets by Hermann Esser (1845–1908). Digitally enhanced from our own 5th…

Hill shading guideline from Draughtsman's Alphabets by Hermann Esser (1845–1908). Digitally enhanced from our own 5th edition of the publication.

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