Here is a very nice resource that makes use of modern technology (a collaborative wiki) to help users of Presidential Libraries.
The American Historical Association has a wiki (Archives Wiki) intended to be a clearinghouse of information about archival resources throughout the world. It has a page for each presidential library. (See list here.)
Although there is not a lot there yet, this is a place where historians can add comments, hints, problems, suggestions about using the resources at the Presidential libraries.
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