The numerical annotations on the Passenger manifests refer to the Certificate of
Arrival. When the passenger was naturalized the number of the Certificate of
Arrival was noted near the passenger's name. So if there is a number that is a
good indication that the immigrant was naturalized. However, just because the
number is not there does not mean the passenger was not naturalized.
Researching: POVLOTSKY, BASOI, SPECTER, YAMPOLSKY