I've done multiple Google searches and haven't come across anything apart from redirects to the actual book
[Footnote 1: Dion Cassius, (l. liv. p. 736,) with the annotations of Reimar, who has collected all that Roman vanity has left upon the subject. The marble of Ancyra, on which Augustus recorded his own exploits, asserted that he compelled the Parthians to restore the ensigns of Crassus.]
Any answers would be appreciated
This refers to Herrmann Samuel Reimar, also known as Reimarus, a German Enlightenment philosopher who put together one of the early editions/commentaries of Cassius Dio.
Reimar, H. S. 1750-1752. Cassii Dionis Cocceiani Historiae Romanae Quae Supersunt. 2 Vols. Hamburg.
Mulsow, M. (editor) 2011. Between philology and radical Enlightenment : Hermann Samuel Reimarus (1694-1768). Leiden; Boston (Mass.): Brill.