Cathy Conner asked about the codes......perhaps this will help.
I've culled these notes >from various sources, but i would bet that
the INS web site (http://www.nara.gov) will have another list
somewhere on it.

--Notations on Passenger Record:"435/621" (or numbers in similar
form) with no date given = NY file number (file does not survive).
Indicates early verification/record check.
--"432731/435765" (or similar format) = Subject was a permanent
resident, returning >from a visit abroad with a Reentry Permit.
--Number in Occupation column (ex: 11-54678 or 2-x-237694) =
Verification for naturalization purposes, usually after 1926.
First number is naturalization district number, second is either
application number or the Certificate of Arrival number. An "x"
dividing the number indicates no fee was required for the
Certificate of Arrival. Indicates activity in response to filing
of a Declaration of Intention or Petition for Naturalization.
-- "C/A or c/a" = Certificate of Arrival." Indicates activity in
response to filing of a Declaration of Intention or Petition for
Naturalization.
--"V/L or v/l" = Verification of Landing. Indicates
verification/record check.
--"404" or "505" = Verification form used to transmit manifest
information to requesting INS office, thus indicating a
verification/record check.
--Name (only) crossed out with line, or completely x'd out, with
another name written in = name officially amended - additional
records may survive
--"W/A or w/a" = Warrant of arrest, additional records may survive
--LPC= Likely to become a Public Charge: if little money and no
one willing to accept responsibility for him.
--"X" at far left, before or in name column = Subject was
temporarily detained, see list of detained aliens at end of
manifest.
--"S.I." or "B.S.I." at far left, before name = Subject was held
for Board of Special Inquiry hearing, see list of aliens held for
Special Inquiry at end of manifest.
--"USB" = US-Born, sometimes found on records of returning
citizens.
--"USC" = US Citizen, sometimes found on records of returning
citizens.
--C-###### = Naturalization certificate number, sometimes found on
records of returning citizens.

happy hunting!
Regards,
Phyllis (phylliskramer1@...) of Wilton & Savannah
Searching KRAMER, WISNER, BEIM >from JASIENICA, Galicia
STECHER, TRACHMAN, FEIR, KORNREICH >from ZMIGROD,Galicia
LINDNER, MAUER, BERLIN, EICHEL >from ROHATYN, Galicia and YASI
SCHEINER, KANDEL, SCHIMMEL >from Strzyzow, Dubieko,Galicia
GUMBRECHT, ZIEGLER >from Hannover, Germany