These chapters were published in revised form as: Maus: A Survivor's Tale (Pantheon, 1986 series).
Chapter 5 has the 4-page 'Prisoner on the Hell Planet' woven into the narrative; this human holocaust story appeared originally in Short Order Comix (Head Press, 1973 series) #1
This series was followed by: Raw (Penguin Books, 1989 series) vol.2 #1 to #3
see also: Read Yourself Raw (Pantheon, 1987 Series), which reprints excerpts from the first three issues, and: Funny Aminals (Apex Novelties, 1972 Series) for the first appearance of Maus