Heinrich Harder (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Heinrich Harder" in Catalan language version.

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lindahall.org

Scientist of the Day - Heinrich Harder, Biblioteca Linda Hall, Science, Engineering & Technology Information for the World', 5 febrer 2016.

youtube.com

"Animales del Mundo Prehistórico", de Wilhelm Boelsche, con ilustraciones de Heinrich Harder (vídeo amb subtítols en castellà), YouTube, 22 abril 2015.