encyclopedias
For subject specific encyclopedias see subjects under subject search
| Canadian Encyclopedia | Historica |
| Catholic Encyclopedia | New Advent. 1914 edition |
| Columbia Encyclopedia | Bartleby. 51,000 entires, 80,000 hypertext cross-references. |
| Encarta | Microsoft. 4,500 articles |
| Encyclopedia Britannica | |
| Information Please Almanac | Family Education Network |
| Wikipedia | Open content encyclopedia with >1.3 million articles |