16. Citizenship of the foreign born.
478.
Column 16. Citizenship of the Foreign Born.-An entry is to be made in this column for all foreign-born persons and for persons born at sea, male and female, of whatever age, as follows:
"Na"
(for naturalized) if the persons has become an American citizen, either by taking out second or final naturalization papers or through the naturalization of either parent.
"Pa"
(for first papers) if the person has declared intention to become an American citizen and has taken out "first papers."
"Al"
(for alien) if the person has neither become naturalized nor taken out first papers.
"Am Cit"
(for American citizen born abroad) if the foreign-born person or person born at sea was an American citizen at birth.