I n the five decades since Lennart Nilsson’s portrait of an 18-week-old human fetus appeared on the cover of the April 30, 1965, issue of LIFE—along with other, ... 1965, issue of LIFE magazine.

LIFE’s coverage of the marches began in its March 19, 1965 issue, the cover of which shows a line of solemn marchers, two by two, disappearing over the horizon as helmeted troopers look on.