The standard in the 1960s, USAS X3.4-1968, actually prescribed both forms. But (in §4.1.2.2) it "strongly recommended" that people "use CR and LF to obtain the

The standard in the 1960s, USAS X3.4-1968, actually prescribed both forms. But (in §4.1.2.2) it "strongly recommended" that people "use CR and LF to obtain the effect of New Line".