Could anyone provide a paper or email copy of either the manual or a schematic for the two Victoreen, sensitive (0-1 mR/h lowest scale) ion chambers: 471 440RF/C Thanks in advance for perusing your archives!! J. Marshall Reber, ScD 165 Berkeley St. Methuen MA 01844 Tel/Fax: 978-683-6540 Alternate Email: reber at alum.mit.edu