Table 1

Overview of bibliometric sources containing records of OA books

ServiceURLSearch criteria and volume of resultsUnique identifier availabilityMethod and time of access
The Lenshttps://www.lens.org348 678 records under “Open Access” and “Book” published between year 0 and 2050ISBN = 0%
DOI = 99%		Web service queried 06052022
OpenAIREhttps://explore.openaire.eu/211 749 records under “Open Access” and “Books” after removal of content labeled as chapters, thesis, reports, and preprintsISBN = 0%
DOI = 99%		JSON dataset by Baglioni et al. (2022). Data based on OpenAire dump published 23122021
OpenAlexhttps://openalex.org/134 718 records of type “Book”, or “Monograph” and OA type Gold, Hybrid or BronzeISBN = 0%
DOI = 100%		API queried 04072022
DOABhttps://www.doabooks.org/52 002 scholarly peer-reviewed books, all OA, 49 600 after removing items tagged as chapterISBN = 82%
DOI = 83%		CSV dataset accessed 06052022
WorldCat (OCLC)https://www.worldcat.org/4485 non-fiction e-books tagged as OAISBN = 100%
DOI = 21%		Website queried 28042022
Scielo Bookshttps://books.scielo.org/1006 OA book recordsISBN = 100%
DOI = 93%		Website queried 06052022

Source(s): Created by authors

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