Series of shots inside Alta Vista Post Office Terminal: DOLLY SHOT along length of coding desk suite (CDS) from full binney being unloaded to sorted mail in bins (2 shots; 2:44). Slow DOLLY SHOT along output stackers (2 shots; 2:44). MLS of row of female CDS operators (0:15). CS of female operator (0:18). CU of hand coding (2 shots; 0:35). CUs of output channel for coded letters (0:31).