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Step-by-step explanation:
The two main contribution of Hans Gross to the field of forensic science are
1. He the first book that described the application of scientific tool and methods to the filed of criminal investigation.
2. He detailed the assistance that investigators could expect from the fields of microscopy, chemistry, physics, mineralogy, zoology, botany, anthropometry and fingerprinting. He later introduces the forensic journal, which improves methods of scientific crime investigation.