Four stories on Barsoom: The Ancient Dead, The Black Pirates of Barsoom, Escape on Mars, and Invisible Men of Mars.
No matter how instinctively gregarious one may be there are times when one longs for solitude. I like people. I like to be with my family, my friends, my fighting men; and probably just because I am so keen for companionship, I am at times equally keen to be alone. It is at such times that I can best resolve the knotty problems of government in times of war or peace. It is then that I can meditate upon all the various aspects of a full life such as I lead; and, being human, I have plenty of mistakes upon which to meditate that I may fortify myself against their recommission.
When I feel that strange urge for solitude coming over me, it is my usual custom to take a one man flier and range the dead sea bottoms and the other uninhabited wildernesses of this dying planet; for there indeed is solitude. There are vast areas on Mars where no human foot has ever trod, and other vast areas that for thousands of years have known only the giant green men, the wandering nomads of the ocher deserts.
Sometimes I am away for weeks on these glorious adventures in solitude. Because of them, I probably know more of the geography and topography of Mars than any other living man; for they and my other adventurous excursions upon the planet have carried me from the Lost Sea of Korus, in the Valley Dor at the frozen South to Okar, land of the black bearded yellow men of the frozen North, and from Kaol to Bantoom; and yet there are many parts of Barsoom that I have not visited, which will not seem so strange when there is taken into consideration the fact that although the area of Mars is like more than one fourth that of Earth its land area is almost eight million square miles greater. That is because Barsoom has no large bodies of surface water, its largest known ocean being entirely subterranean. Also, I think you will admit, fifty-six million square miles is a lot of territory to know thoroughly.