This study uses engineering dissertations from Proquest Dissertations & Theses to create a data set of citations for the comparison of fee-based databases, Compendex and Scopus, against Google Scholar. From 1950 to 2017 Google Scholar outperformed both Compendex and Scopus in discoverability of citations in nine engineering subjects. The "readme.txt" file explains our methods and data The file "GoogleScholarData.csv" contains 20 randomly sampled from each of the 9 subjects over 7 decades (1260 data records) The script "parse_dissertation_citiations_html.R" extracted the data from the Proquest website.
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