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Creation Date 

1. Before 1958  (441,534)
2. 1958 To 1973  (935,603)
3. 1974 To 1989  (2,890,845)
4. 1990 To 2006  (7,408,178)
5. After 2006  (15,141,419)
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New Records 

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5. Reviews  (113,031)
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Subject 

1. Science & Technology  (26,029,295)
2. Life Sciences & Biomedicine  (16,457,460)
3. Humans  (7,323,574)
4. Physical Sciences  (6,727,935)
5. Technology  (4,494,185)
6. Female  (3,712,810)
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12. Physics  (2,449,994)
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15. Middle Aged  (1,838,475)
16. Medical Sciences  (1,832,516)
17. Biochemistry & Molecular Biology  (1,710,700)
18. Science & Technology - Other Topics  (1,670,906)
19. Fundamental And Applied Biological Sciences. Psychology  (1,474,790)
20. General & Internal Medicine  (1,404,758)
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Databases 

1. ProQuest Central  (11,329,894)
2. MEDLINE  (11,049,552)
3. DOAJ Directory of Open Access Journals  (7,630,647)
4. Geneva Foundation Free Medical Journals at publisher websites  (7,026,226)
5. Open Access: PubMed Central  (6,688,757)
6. ROAD: Directory of Open Access Scholarly Resources  (5,761,433)
7. HighWire Press (Free Journals)  (2,517,133)
8. Open Access: Wiley-Blackwell Open Access Journals  (1,098,797)
9. Springer_OA刊  (1,027,533)
10. ProQuest One Psychology  (1,020,564)
11. Open Access: Nature Open Access  (488,912)
12. Hyper Article en Ligne (HAL) (Open Access)  (409,328)
13. Open Access: IOP Publishing Free Content  (359,987)
14. IngentaConnect  (330,692)
15. PLoS (Open access)  (326,719)
16. Journals@Ovid Open Access Journal Collection Rolling  (322,410)
17. Open Access: Oxford University Press Open Journals  (309,606)
18. JSTOR Early Journal Content (Open Access)  (288,127)
19. Taylor & Francis_OA刊  (270,444)
20. Open Access: Freely Accessible Journals by multiple vendors  (266,251)
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Language 

1. English  (26,598,340)
2. Japanese  (3,177,160)
3. Portuguese  (212,602)
4. German  (75,326)
5. Spanish  (68,489)
6. French  (59,898)
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13. Hungarian  (7,824)
14. Italian  (7,577)
15. Czech  (6,239)
16. Dutch  (4,317)
17. Slovak  (3,679)
18. Croatian  (2,651)
19. Ukrainian  (2,333)
20. Serbian  (1,770)
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Journal Title 

1. Bmj  (184,130)
2. British Medical Journal  (121,744)
3. Journal Of The American Chemical Society  (103,215)
4. Nature  (210,029)
5. Plos One  (274,657)
6. Proceedings Of The National Academy Of Sciences - Pnas  (139,037)
7. Scientific Reports  (189,494)
8. The Astrophysical Journal  (111,896)
9. The Journal Of Biological Chemistry  (161,267)
10. The Lancet  (122,808)
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