passenger manifest missing/not indexed? #general

Ryan Cramer

On my great-grandfather’s immigration docs he indicated that he (Julius Silver) arrived in New York on Dec 25, 1904 on the vessel “SS Rotterdam”, sailing from Rotterdam.  I can’t find a passenger manifest that matches dates and locations.  Are some of them still unpublished/not indexed?  If anyone has a source where I’m able to find this I’d really appreciate it.   Thank you!

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