PAGenWeb McKean County, Pennsylvania 

Register Of Wills
McKean County Courthouse
P.O. Box 202
Smethport, Pa. 16749
814-887-3260
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Prothonotary Office
McKean County Courthouse
P.O. Box 273
Smethport, PA 16749
814-887-3271
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Pennsylvania Department Of Health
Division Of Vital Records
P.O. Box 1528
New Castle, PA 16103-1528
or
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There are no "State" Census in PA, only the Federal ones. The UPB Library has Pa. and NY Census index books 1800-1850, plus a few for other states in various years.
The aforementioned are "standard" histories of the area and copies for most of them are found in McKean County Historical Society, Bradford Area Library, UPB Library. Hardesty's book is in the McKean Historical Society and Bradford Landmark Society collections. Bradford Landmark Society has copies of them all.
Information on the two books published by the Bradford Landmark