Bergmann's Interplanetary Venture, Bk 6 — George G. Pinneo

Bk6 details the expansion of Bergmann's Orbitat in preparation to explore the Lunar surface near Cabeus Crater and establish a permanent presence on Luna. They would finish the design and assemble a marship to move on toward Mars! 'Barsoomian' would take them out from Earth where they could plan a first Martian landing if the terraformed atmosphere was as good as they expected. 'Accelerator' would serve as their Martian 'lander' so they could establish the first Martian landing.