William Branham Explains His 1933 Prophecies

William Branham is remembered by historians for his seven prophecies of 1933. William Branham himself couldn't remember them, however, even though he claimed to have read them in the 1950s and 1960s -- directly from a paper that was buried in 1931, 1932, or 1933.

How did historians choose which of the several "prophecies" to include in the seven? And why do they call them the "1933 Prophecies" when the paper stated 1932?