I am on a quest to find holdings of business directories published through the 1900s by R. G. Dun & Co./Dun & Bradstreet, Inc.  Not very many of the volumes appear in WorldCat and another small number are listed in PastPerfect Online.  The title varied and included "The Mercantile Agency reference book" and "Reference Book."  Editions for Kansas and Nebraska are of particular interest.  If other institutions hold these, have any been digitized?  

Thank you!

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