Refine My Results

Creation Date 

1. Before 1957  (64,830,045)
2. 1957 To 1973  (15,795,391)
3. 1974 To 1990  (35,751,347)
4. 1991 To 2008  (91,758,831)
5. After 2008  (163,923,182)
6. More options 

New Records 

1. New From Last Week  (596,922)
2. New From Last Month  (5,156,098)
3. New From Last 3 Month  (7,965,770)
4. More options 

Resource Type 

1. Patents  (160,399,446)
2. Articles  (102,806,621)
3. Images  (43,128,235)
4. Web Resources  (34,783,260)
5. magazinearticle  (15,745,007)
6. Reviews  (8,844,068)
7. Book Chapters  (7,368,351)
8. Books  (7,298,705)
9. Newspaper Articles  (4,485,130)
10. Journals  (3,185,220)
11. Thesises (postgraduate)  (2,577,650)
12. Reports  (2,569,211)
13. Audio  (1,615,931)
14. Archival Material / Manuscripts  (1,566,275)
15. Conference Proceedings  (1,120,740)
16. Government Documents  (1,054,125)
17. Newsletter Articles  (1,036,097)
18. Videos  (582,227)
19. Datasets  (562,208)
20. Text Resources  (500,078)
21. More options 

Subject 

1. Transporting  (37,007,072)
2. Performing Operations  (37,006,545)
3. Physics  (36,020,864)
4. Electricity  (31,215,891)
5. Human Necessities  (26,299,795)
6. Science & Technology  (25,983,726)
7. Chemistry  (25,091,624)
8. Metallurgy  (22,335,963)
9. Mechanical Engineering  (17,659,452)
10. Heating  (17,540,292)
11. Weapons  (17,522,669)
12. Lighting  (17,522,607)
13. Blasting  (17,481,345)
14. Life Sciences & Biomedicine  (16,429,365)
15. Basic Electric Elements  (13,127,143)
16. Hygiene  (13,087,820)
17. Medical Or Veterinary Science  (13,048,837)
18. Counting  (11,333,149)
19. Computing  (11,324,487)
20. Calculating  (11,323,095)
21. More options 

Databases 

1. esp@cenet  (146,839,293)
2. Europeana Collections  (70,708,641)
3. ProQuest Central  (65,168,592)
4. DOAJ Directory of Open Access Journals  (20,484,439)
5. ROAD: Directory of Open Access Scholarly Resources  (16,220,854)
6. Freely Accessible Journals  (14,282,233)
7. MEDLINE  (13,867,537)
8. Open Access: PubMed Central  (12,460,184)
9. Gallica - All content.  (8,470,094)
10. Open Access: Gallica Periodicals  (7,669,393)
11. USPTO Published Applications  (7,508,356)
12. Gallica - Open Access  (6,665,450)
13. USPTO Issued Patents  (6,039,113)
14. HighWire Press (Free Journals)  (5,105,299)
15. Ebook Central - Academic Complete  (5,006,511)
16. Open Access: Freely Accessible Journals by multiple vendors  (4,999,867)
17. HathiTrust Digital Library Full View Worldwide  (4,620,213)
18. ProQuest One Psychology  (3,424,769)
19. arXiv.org  (2,449,825)
20. JSTOR Early Journal Content Free  (1,981,096)
21. More options 

Language 

1. English  (281,803,008)
2. Chinese  (50,641,106)
3. French  (37,254,953)
4. German  (32,388,374)
5. Spanish  (12,119,967)
6. Japanese  (11,511,322)
7. Korean  (6,660,703)
8. Swedish  (5,688,120)
9. Dutch  (4,917,731)
10. Polish  (4,812,910)
11. Italian  (4,382,974)
12. Norwegian  (4,307,266)
13. Portuguese  (3,139,555)
14. Russian  (2,838,430)
15. Danish  (2,102,734)
16. Latin  (1,750,073)
17. Czech  (1,390,297)
18. Finnish  (1,379,859)
19. Catalan  (1,370,081)
20. Hungarian  (1,349,764)
21. More options 

Journal Title 

1. Arxiv  (679,644)
2. Arxiv.Org  (1,866,128)
3. Billboard  (473,916)
4. Bmj  (453,751)
5. British Medical Journal  (734,894)
6. Nature  (564,938)
7. New York Times  (2,789,866)
8. Notes And Queries  (752,817)
9. The Lancet  (670,704)
10. The Washington Post  (780,029)
11. More options