The largest and most comprehensive dictionary of the English language as it is currently used today.
The famous unabridged is the latest in the long line of dictionaries directly descended from Noah Websters original English-language dictionary of 1828. It is updated on a continuing basis.
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Despite its title, this multivolume reference work is really an encyclopedia. Monumental in scope, it is the largest and most comprehensive reference work on the visual arts that has ever been published. Don't start any research on art without checking this source. It is also available online in Oxford Art Online.
Although older than the encyclopedia above, this is still a useful and scholarly work. It is richly illustrated with thousands of color and black-and-white plates, which are all found together at the back of each volume.
These books contain brief articles devoted to topics relating to world art of the 20th century. The first one extends also into the first few years of the 21st century.
The first of these encyclopedias is a multivolume work containing scholarly articles on all aspects of architecture. The second is a beautifully illustrated one-volume encyclopedia devoted to American architecture of all time periods, with strong coverage of the twentieth century. The third, a 3-volume set, treats world architecture of the twentieth century only. All three encyclopedias supplement in greater depth the information you can find on architecture in the general art encyclopedias.
These are excellent places to begin research on photography or photographers. The Encyclopédie, which is written in both French and English, provides useful chronologies and bibliographies and is a good place to start research on a particular photographer.
This reference book offers articles on artists, techniques, and movements that were aesthetically innovative and forged new paths in artistic developments when they first appeared. Besides the visual arts, it also includes innovators in the fields of music, dance, theatre, and film.