Re: Hessians from Rhineland Pfalz
One famous collection is at Shadek-Fackenthal Library, Franklin and Marshall College, Lancaster, PA.
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Another notable one is at Abdel Ross Wentz Library, Lutheran Theological Seminary, Gettysburg, PA.
You can do such research in person at either place, but must make contact before you go.
You have already been given information about what collection(s) to consult at the British Archives in Kew, England.