What’s missing from Google books?

Michele Seikel and Thomas Steele
Points out that maps, plates, and plans have been a staple within published materials in the fields of history, geology, geography, and land use (agriculture), all of which rely heavily on maps, for two hundred years. A study published in 2010, entitled “Google Books as a General Research Collection,” identified a problem encountered with digitized versions of monographs that include folded illustrations. The article pointed out that many titles in Google Books could have been digitized without unfolding their accompanying illustrations, with the help of the industrial scanning process, used to digitize huge numbers of titles quickly. In order to determine the extent of the problem, this study attempts to- one, compare the numbers of missing or only partly digitized folded illustrations within titles that are fully available for viewing in Google Books and two, other large databases of digitized monographs, Open Library and Project Gutenberg. Indicates that Google Books generally scanned oversized or detached folded illustrations, or else omitted them, whereas Open Library’s scanning process, more often, correctly scanned folded materials.