Turtledove, Harry. "Hindsight"
Divergence: 1949 CE
Summary: A woman from 1988 goes back 40 years and sells stories written in between (e.g., "Neutron Star") plus accounts of famous events (e.g., "Watergate").
Published: In Analog mid-December 1984; Imperial Stars I: The Stars At War (eds. Jerry Pournelle and John F. Carr), Baen 1986 (0671656031); Kaleidoscope, Ballantine/Del Rey 1990 (0345364775BUY); and 3×T, Baen 2004 (0743488350BUY).