Question:  Anarchist Manifesto was written ten years after the publication of a book whose author declared what?
Sentence (from "What Is Property?"): ou Recherche sur le principe du Droit et du Gouvernement" ) is a work of nonfiction on the concept of property and its relation to anarchist philosophy by the French anarchist and mutualist Pierre-Joseph Proudhon, first published in 1840.
Relevant evidence: Yes