International Fantasy Award winner 1951.
A disease of unparalleled destructive force has sprung up almost simultaneously in every corner of the globe, all but destroying the human race. One survivor, strangely immune to the effects of the epidemic, ventures forward to experience a world without man. What he ultimately discovers will prove far more astonishing than anything he'd either dreaded or hoped for.
George Rippey Stewart (1895–1980) was an American toponymist, a novelist, and a professor of English at the University of California, Berkeley. His 1959 book Pickett's Charge, a detailed history of the final attack at Gettysburg, was called "essential for an understanding of the Battle of Gettysburg".
George R. Stewart. Wikipedia.