Barsoom is a 12-book series with 12 primary works first released in 1912 with contributions by Edgar Rice Burroughs and Stuart Moore.
#6 of 10 in Barsoom
1927 • 1 Reader • 172 pages • 4
#8 of 10 in Barsoom
1935 • 7 Readers • 191 pages • 3.3
#9 of 10 in Barsoom
1939 • 9 Readers • 160 pages • 3.5
#10 of 10 in Barsoom
1941 • 9 Readers • 192 pages • 3.3