When were numeric contractions for ordinals first used, as in 1st, 2nd, 3rd, 6th instead of first, second, third, sixth?
Should a sentence ending with the word Ph. D. end with one or two periods? He has a Ph.D. He has a Ph.D.. Is there some established formatting rule for this situation? It might be a ...
What is the correct form, and why, in scientific papers (US English)? e.g. e. g.