50 Sed hoc quidem non est saepe faciendum nec umquam nisi aut rei publicae causa, ut ii, quos ante dixi, aut ulciscendi, ut duo Luculli, aut patrocinii, ut nos pro Siculis, pro Sardis in Albucio Iulius.
— from De Officiis by Marcus Tullius Cicero

In those cases where it was not possible to determine the original text with much certainty (usually numbers and rare proper nouns which cannot be deduced from context) a pair of braces {} indicates where the illegible text was.
— from The Lives of the Fathers, Martyrs, and Other Principal Saints. January, February, March by Alban Butler

The dependence of suicide upon nationality and race presents a number of problems of great interest, but of extraordinary difficulty and complexity.
— from McClure's Magazine, Vol 31, No 2, June 1908 by Various

Unpublished notes and reprinted papers.
— from The Book Review Digest, Volume 13, 1917 Thirteenth Annual Cumulation Reviews of 1917 Books by Various

(N ‘17) Street, G: E. Unpublished notes and reprinted papers.
— from The Book Review Digest, Volume 13, 1917 Thirteenth Annual Cumulation Reviews of 1917 Books by Various

Dickson, H. (Ja ‘18) Unpublished notes and reprinted papers.
— from The Book Review Digest, Volume 13, 1917 Thirteenth Annual Cumulation Reviews of 1917 Books by Various