Encyclopedia of contemporary American cultureGary W. McDonogh, Gregg, Robert, Cindy H. Wong · First published 2000Open the Tome
After Vietnam, the future of American foreign policyRobert W. Gregg · First published 1971Open the Tome
International organization in the Western HemisphereJohn C Dreier, Robert W. Gregg · First published 1968Open the Tome
The United Nations System And Its FunctionsRobert W. & Michael Barkun (edits) Gregg · First published 1968Open the Tome
Industrial psychology second editionB. Von Haller Gilmer, W.E Crissy, Rober Glaser, Lee W. Gregg, Thomas L. HIlton, Myron L. Joseph, Harry W. Karn, Robert E. Krug, RJ lewis and Robert B. Miller · First published 1966Open the Tome
PlatoΠλάτων, Harold North Fowler, W. R. M. Lamb, Robert Gregg Bury · First published 1914Open the Tome
