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Preparing Comparative Materials in Order to Require a Graphic Expertise of the Signature The author of the present work analyses issues regarding the preparatory means that are necessary when the investigation officer requires a graphological expertise, especially collecting comparative specimens. He proposes various sources, these samples can be taken from, tactical and organisational procedures of obtaining free, conventionally-free and experimental comparative specimens.doi:10.5281/zenodo.3875058 fatcat:vpdlkd4btfe43nkvceqivw3woi