The Phenomenology of Mind or Phenomenology of Spirit (German: Phänomenologie des Geistes), originally published in 1807, was the first major philosophical work by Georg Wilhelm Friedrich Hegel, and still the most influential.
Like much of Hegel's writing, it is notoriously difficult, but can be described as an account of the necessary steps in the development of thought. It's description of the relationship between self and other is significant for establishing the irreducibly social nature of consciousness.
The Phenomenology of Mind at online books stores
Free online texts
Marxists Internet Archive: Hegel's Phenomenology of Mind, translated by Terry Pinkard.
University of Adelaide/Internet Archive: The Phenomenology of Mind, translated by J.B. Baillie. EPUB, HTML and MOBI formats.
Wikisource: The Phenomenology of Mind, translated by James Black Baillie. Currently introduction only. HTML and other formats.
Deutsches Textarchiv: Die Phänomenologie des Geistes. HTML, Text, XML formats.
Gutenberg: Phänomenologie des Geistes. EPUB, HTML, MOBI and PDF formats.
Internet Archive: System der Wissenschaft - Erster Theil, die Phänomenologie des Geistes. EPUB, MOBI, PDF and TXT formats.