The bibliography lists more than 25,000 items produced between 1540 and the present. It includes books, periodicals, serials, maps, audio-visual works, and electronic media in 34 subject areas. Coverage includes the Grand Canyon of Arizona and the lower Colorado River corridor between Glen Canyon Dam, Arizona, and the Colorado River delta in Mexico. Greatly expanded and revised from earlier editions published by Grand Canyon Natural History Association.

the AEA\'s electronic bibliography of economics literature throughout the world. EconLit contains abstracts, indexing, and links to full-text articles in economics journals. It abstracts books and indexes articles in books, working papers series, and dissertations. EconLit also provides the full-text of JEL book reviews.