MIL-C-293B (NOTICE-2), MILITARY SPECIFICATION: CALCIUM CARBONATE (18-JAN-2013)
MIL-C-293B (NOTICE-2), MILITARY SPECIFICATION: CALCIUM CARBONATE (18-JAN-2013)., MIL-C-293B (AR), dated 8 April 1974, is inactive for new design, and is no longer used, except
for replacement purposes.