http://www2.iath.virginia.edu/holocaust/spiegelman.html
This site dives more thoroughly into the historical aspects of Maus (European Judaism) and also explores the various underlying themes of the narrative (Art’s and Vladek’s fractured relationship, Vladek’s burning of Anja’s journals, and Art’s transcription of Vladek’s story).

http://www9.georgetown.edu/faculty/bassr/218/projects/oliver/MausbyAO.htm
This site studies the literary form of Maus and how it’s unique delivery casts a different light on the Holocaust.