Found this heatrock in a San Francisco thrift store a couple of years ago. The illustrations sprinkled throughout the book are OK - not nearly as robust and well-executed as the cover image. The artwork is by Ati Forberg, who illustrated a few other children's books throughout the 1960s.
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Fans of Diplo might recognize this cover as being from the same series as the volume ganked for the cover artwork for he and Tripledouble's incredible psych / funk mix CD "AEIOU 2."