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Author/Creator
- Research Publications, inc345
- Geo. A. Ogle & Co147
- United States103
- ebrary, Inc94
- R.L. Polk & Co86
- Title Atlas Co. (Minneapolis, Minn.)62
- Unesco60
- Directory Service Company55
- United States. Federal Aviation Administration52
- Yale Law School50
- Foundation Center47
- Anderson Publishing Company46
- Price & Lee Co43
- United States. Administration on Aging43
- National Agricultural Library (U.S.)41
- Gale Research Company37
- United States. Environmental Protection Agency37
- Gale Research Inc35
- United States. Office of Education35
- United States. Office of Educational Research and Improvement35