Processing Note: Baltimore, 1977
From the column "cell" onward (digits 696 to 832), the information was not digitized correctly for the majority of entries.

Unknown variables - 

Unknown labels -
cell:
triptyp:
1 instance of "1" - no label
1 instance of "2" - no label
Please see documentation for 11 - 70

715 instances of non-4 digit responses - bad data
Please see documentation for 4 digit responses