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Ancestors of Marguerite and John Eyerman: being a supplement to The ancestors of Marguerite Eyerman 1899
http://archive.org/details/ancestorsofmargu00eyerGenealogical studies; Author: Eyerman, John, 1902
http://archive.org/details/genealogicalstud01eyerOther Sites where books are often found free of charge:
Open Library
http://openlibrary.org/searchInternet Archive
http://www.archive.orgGoogle Books
http://www.googlebooks.comFamily History Library Catalog
https://www.familysearch.org/eng/library/fhlc/