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GeoRef

References and selected abstracts to the world's literature in geology, covering North America since 1669 and other areas since 1933.

GPO

Provides citations of government publications, with links to full text where available.

GreenFILE

Provides citations and abstracts of scholarly and general interest titles, government documents and reports related to the relationship between human beings and the environment.

Grove encyclopedia of classical art & architecture

Provides in-depth articles containing biographies as well as thematic entries on architecture, ceramics, metalwork, mosaics, painting and sculpture.