“gerhardt” are materials gathered from frank a. gerhardt’s monumental site on u.s. maritime commission’s building program.
“ship.cards” contains all ship cards from the marad vessel history database with the exception of united states lines-specific cards.
“united.states.lines-cards” contains all cards pertinent to the united states lines as found in the marad database.
“united.states.lines-lists” are various sources processed into spreadsheets. see the !readme file in the directory for further information.