circular Chart of Knowledge by S. G. Bocholtz, Boston (Chart of Knowledge Co. of America). One side of this volvelle (i.e., a �wheel chart� of paper construction with movable parts) is a map of the western hemisphere plus part of Africa and Europe � with
short_title
circular Chart of Knowledge by S. G. Bocholtz, Boston (Chart of Knowledge Co. of America). One side of this volvelle (i.e., a �wheel chart� of paper construction with movable parts) is a map of the western hemisphere plus part of Africa and Europe � with
Short Title
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