Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Top 10 countries by number of publications in AJOL_
| Country | # pubs |
|---|---|
| Nigeria | 25,902 |
| South Africa | 24,755 |
| United States | 5,528 |
| China | 3,919 |
| India | 3,615 |
| Ethiopia | 3,132 |
| United Kingdom | 2,899 |
| Ghana | 2,723 |
| Kenya | 2,461 |
| Tanzania | 1,970 |
Population of journal metadata fields_
| Field | NAs | % NAs | Final N |
|---|---|---|---|
| Title | 0 | 0 | 739 |
| eISSN | 84 | 11.4 | 655 |
| ISSN print | 334 | 45.2 | 405 |
| country | 0 | 0 | 739 |
| JPPS status | 5 | 0.7 | 734 |
| OA | 0 | 0 | 739 |
| Research area | 3 | 0.4 | 736 |
Population of publication metadata fields_
| Field | NAs | % NAs | Selected | Final N |
|---|---|---|---|---|
| input_url | 0 | 0 | 1 | 223,981 |
| DC.Creator.PersonalName | 11,866 | 5.00 | 0 | - |
| DC.Date.created | 76,341 | 32.18 | 0 | - |
| DC.Date.dateSubmitted | 11,767 | 4.96 | 0 | - |
| DC.Date.issued | 11,872 | 5.00 | 1 | 223,876 |
| DC.Date.modified | 11,767 | 4.96 | 0 | - |
| DC.Description | 11,770 | 4.96 | 1 | 192,933 |
| DC.Format | 17,566 | 7.40 | 0 | - |
| DC.Identifier | 11,767 | 4.96 | 1 | 223,981 |
| DC.Identifier.pageNumber | 69,133 | 29.14 | 0 | - |
| DC.Identifier.URI | 11,767 | 4.96 | 0 | - |
| DC.Language | 11,767 | 4.96 | 0 | - |
| DC.Rights | 11,767 | 4.96 | 0 | - |
| DC.Source | 11,767 | 4.96 | 1 | 223,981 |
| DC.Source.ISSN | 13,498 | 5.70 | 0 | - |
| DC.Source.Issue | 28,964 | 12.21 | 1 | 206,866 |
| DC.Source.Volume | 12,298 | 5.18 | 1 | 223,450 |
| DC.Source.URI | 11,767 | 4.96 | 0 | - |
| DC.Title | 11,767 | 4.96 | 1 | 223,981 |
| DC.Type | 11,767 | 4.96 | 0 | - |
| DC.Type.articleType | 11,767 | 4.96 | 0 | - |
| gs_meta_revision | 11,767 | 4.96 | 0 | - |
| citation_journal_title | 11,767 | 4.96 | 0 | - |
| citation_journal_abbrev | 11,767 | 4.96 | 0 | - |
| citation_issn | 13,498 | 5.70 | 0 | - |
| citation_author | 11,767 | 4.97 | 0 | - |
| citation_title | 11,785 | 4.96 | 0 | - |
| citation_language | 11,767 | 4.96 | 0 | - |
| citation_date | 11,767 | 4.96 | 0 | - |
| citation_volume | 12,298 | 45.18 | 0 | - |
| citation_issue | 28,964 | 12.21 | 0 | - |
| citation_firstpage | 69,177 | 29.14 | 1 | 166,217 |
| citation_lastpage | 69,137 | 29.16 | 1 | 166,056 |
| citation_abstract_html_url | 11,767 | 4.96 | 0 | - |
| citation_pdf_url | 18,314 | 7.72 | 0 | - |
| DC.Subject | 114,973 | 48.46 | 1 | 121,399 |
| citation_keywords | 114,973 | 48.46 | 0 | - |
| DC.Identifier.DOI | 137,180 | 57.82 | 1 | 99,073 |
| citation_doi | 137,180 | 57.82 | 0 | - |
| citation_author_institution | 212,079 | 89.40 | 0 | - |
| DC.Coverage | 237,263 | 100 | 0 | - |
| citation_reference | 237,232 | 99.99 | 0 | - |
| DC.Title.Alternative | 237,263 | 100 | 0 | - |