Re: Milder Family
The Hamburg Emigration Record for them in 1903 indicates they were from Schwetz, W.Pr. (West Preussen or Prussia).
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This is in the Region of Marienwerder in what is today Poland. Schwetz is today known as Swiecie.
The LDS has the microfilms for both the Lutheran and Roman Catholic records in Schwetz for the timeframe you require.