The release of his book Handbuch für Untersuchungsrichter, Polizeibeamte, Gendarmen (Handbook for Coroners, police officials, military policemen) in 1893, is marked as the birth of the field of criminalistics. The work combined in one system fields of knowledge that had not been previously integrated, such as psychology and science, and which could be successfully used against crime. Gross adapted some fields to the needs of criminal investigation, such as crime scene photography. In 1912, he founded the Institute of Criminalistics (later: Institute of Criminology), as part of the University of Graz' Law School, which was to be followed by many similar institutes all over the world.
Handbuch für Untersuchungsrichter als System der Kriminalistik (Handbook for Examining Magistrates as a System of Criminology), 2 vols., 1893.
Kriminalpsychologie (Criminal Psychology), 1898.
Enzyklopädie der Kriminalistik (Encyclopedia of Criminology), 1901.
Die Erforschung des Sachverhalts strafbarer Handlungen (The Investigation of the Circumstances of Crimes).