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2. Cryptography  (2,148,680)
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13. Appliances For Teaching, Or Communicating With, The Blind,deaf Or Mute  (484,929)
14. Globes  (484,929)
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16. Computing  (431,485)
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18. Optics  (343,916)
19. Electric Digital Data Processing  (302,121)
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Databases 

1. esp@cenet  (2,177,885)
2. ProQuest Central  (42,350)
3. DOAJ Directory of Open Access Journals  (22,196)
4. ROAD: Directory of Open Access Scholarly Resources  (15,977)
5. GFMER Free Medical Journals  (15,042)
6. PubMed Central  (7,818)
7. IOP Publishing Free Content  (6,322)
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11. JSTOR Early Journal Content  (3,303)
12. ERIC - Full Text Only (Discovery)  (2,557)
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14. Hyper Article en Ligne (HAL) (Open Access)  (1,631)
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18. Coronavirus Research Database  (999)
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20. ProQuest One Psychology  (663)
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Language 

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18. Czech  (1,382)
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20. Romanian  (690)
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1. Applied Sciences  (2,129)
2. European Journal Of Physics  (1,885)
3. Fire Technology  (1,298)
4. Journal Of Phase Equilibria And Diffusion  (1,800)
5. Journal Of Physics: Conference Series  (5,441)
6. Journal Of Physics. Conference Series  (5,601)
7. Materials  (2,989)
8. Nanomaterials  (1,832)
9. Physics Education  (1,167)
10. Science  (2,985)
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