Llana of Gathol and John Carter of Mars (edition 1977)

Contains the final two volumes of the Barsoom series. Llana of Gathol consists of four related novellas. John Carter of Mars, published 14 years after the author's death, contains two unrelated novellas, the first of which, "John Carter and the Giant of Mars" is actually by John Coleman Burroughs, the author's son.

Detailed reviews with biographical and bibliographical information:
Llana of Gathol: http://realmofryan.blogspot.com/2012/12/edgar-rice-burroughss-mars-part-10.html
John Carter of Mars: http://realmofryan.blogspot.com/2012/12/edgar-rice-burroughss-mars-part-11-john.... ( )