Sentence:  "But if they, who are of this Opinion, would but Reflect a little upon the Materials which the Learn'd Men of this Age have afforded by their" <WSD>Bibliothecs</WSD>, Hiſtorical Dictionaries "and" Journals, "they would quickly perceive their Miſtake. By their" <WSD>Bibliothecs</WSD> "I do not here mean their" Libraries, "but their Elaborate Compoſures Publiſh'd under that Title, ſuch as the" New Eccleſiaſtical <WSD>Bibliothec</WSD> "of" M. Du Pin, "wherein we have an Abſtract of all the Works of the" Eccleſiaſtical Writers, "who have liv'd ſince the Birth of our" Saviour "till the Beginning of the laſt Age; which truly is a Work of ſuch Labour and Learning, that it is deſervedly eſteem'd one of the beſt" Eccleſiaſtical Hiſtories "that ever the" World "had."<!-- Italicised thus in the source. --> 
Meaning of the word marked with <WSD> tags:  A (bibliographer)'s (catalogue).