Petrographic aspects of scientific crime detection. - o.O. Based on a paper presented before the American Academy of Forensic Science Section of the American Association for the Advancement of Science, Cleveland, OH, 30.12.1950, by R.H. Jevons - Jevons, R.H (FBI law enforcement bulletin ; March 1951, S. 11-14 : 3 Ill., 1951)