"You may be sure of that," the other answered. "If you think for a
moment how impossible it would be to have all the supervisors and
enumerators work exactly in the same style, you can see how necessary it
must be for some group of persons to go over them to make them all
uniform. Besides which, there are a lot of obvious mistakes that the
editors remedy before the card is punched ready for tabulation. But go
on with your explanation, so that I can see if you really do understand
it."
"The parent columns run the same way, of course," Hamilton continued,
"'U.S.' meaning any one born in the United States, and 'Un.' cases in
which the parentage is unknown. Then 'NP' means native-born parents, and
'FP' foreign-born parents. Further on, 'Na' means Naturalized, 'Al'
stands for Alien, 'Pa' that first papers have been taken out, and 'Un'
unknown. Down the column, 'En' seems to mean that the foreign-born can
speak English, 'Ot' that he can only speak some tongue other than
English. The year of immigration, of course, is obvious. But this
occupation, I can't make head or tail of!"
"That you have to learn," the instructor said. "There is a printed list
here for reference that contains the principal kinds of employment in
the United States and classifies them.
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