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Creation Date 

1. Before 1960  (42,501)
2. 1960 To 1975  (54,089)
3. 1976 To 1991  (233,285)
4. 1992 To 2008  (642,973)
5. After 2008  (1,122,143)
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Resource Type 

1. Patents  (2,101,005)
2. Articles  (38)
3. magazinearticle  (6)
4. Book Chapters  (5)
5. Thesises (postgraduate)  (4)
6. Books  (3)
7. Newsletter Articles  (2)
8. Reports  (2)
9. Web Resources  (2)
10. References  (2)
11. Text Resources  (1)
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Subject 

1. Education  (2,101,028)
2. Advertising  (2,101,007)
3. Cryptography  (2,101,005)
4. Physics  (2,101,005)
5. Display  (2,101,005)
6. Signs  (844,974)
7. Displaying  (844,973)
8. Labels Or Name-Plates  (844,973)
9. Electricity  (548,054)
10. Diagrams  (473,022)
11. Educational Or Demonstration Appliances  (473,021)
12. Planetaria  (473,021)
13. Appliances For Teaching, Or Communicating With, The Blind,deaf Or Mute  (473,021)
14. Globes  (473,021)
15. Calculating  (407,323)
16. Computing  (407,323)
17. Counting  (407,323)
18. Optics  (337,140)
19. Electric Digital Data Processing  (288,539)
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Databases 

1. esp@cenet  (2,101,005)
2. ProQuest Central  (29)
3. MEDLINE  (10)
4. Education Resources Information Center (ERIC)  (9)
5. Freely Accessible Journals  (3)
6. PubMed Central  (3)
7. HighWire Press (Free Journals)  (3)
8. Trove Australian Thesis (Full Text - Open Access)  (3)
9. DOAJ Directory of Open Access Journals  (3)
10. ERIC - Full Text Only (Discovery)  (2)
11. ROAD  (2)
12. ProQuest One Psychology  (2)
13. Ebook Central - Academic Complete  (1)
14. JSTOR Early Journal Content (Open Access)  (1)
15. PLoS (Open access)  (1)
16. DTIC STINET  (1)
17. Springer_OA刊  (1)
18. Arts & Humanities Journals (Open access)  (1)
19. DTIC Technical Reports  (1)
20. Theses.fr  (1)
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Language 

1. English  (1,805,406)
2. Chinese  (511,503)
3. French  (226,194)
4. German  (160,011)
5. Korean  (124,367)
6. Japanese  (113,765)
7. Spanish  (23,045)
8. Russian  (17,860)
9. Portuguese  (11,577)
10. Italian  (6,218)
11. Swedish  (3,976)
12. Dutch  (3,387)
13. Finnish  (2,649)
14. Danish  (2,622)
15. Polish  (2,437)
16. Norwegian  (1,758)
17. Ukrainian  (1,682)
18. Czech  (1,369)
19. Turkish  (1,226)
20. Romanian  (671)
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Journal Title 

1. Agenda  (1)
2. Agriculture And Human Values  (1)
3. Arctic Anthropology  (2)
4. Arts And Activities  (1)
5. Asee Prism  (1)
6. Asian Perspectives  (1)
7. Science And Children  (3)
8. Science Progress  (2)
9. The American Biology Teacher  (2)
10. The Journal Of Consumer Affairs  (2)
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