Robert M. Buntin
J. Allan Hobson
Robert Koppel
Robert Harris
Robert Keeshan
Robert J. Mason
Robert Girardi
Robert Milne
Robert Lafore
Robert Lafore
Robert Harvey
Robert Lafore
Robert Beaumont
Robert Gauvin
Robert Rotenberg
Robert Frost
Peter Hobson
Robert Foster
Robert Holden
Peter Hobson
Robert Rotenberg
Robert Steiner
Robert Gauvin
Robert Yates
Robert R. Moeller
Robert McElroy
Robert Barry
Robert R. Moeller
Robert Stava
Robert Gold
Robert Strong
Robert D. Hughes
Robert Hanna
Robert Ash
Nadine Robert
Robert P. George
Robert K. Campbell
Robert Hoskins
Robert Strauss
Robert R. Mather
Robert D. Banks
Robert Barron
Robert Kinard
Robert W. Cohen
Robert K. Kirshner
Robert Oldani
Robert S. Griswold
Robert Cromarty
Robert Darnton
Robert Hertle
Robert McCorquodale
Robert Obermaier
Robert McLean
Robert Anasi
Robert W. Cohen
Robert Dreicer
D. Patrick Ramsey
Bill Moody
Albert N. Greco
Ilka Hüftle
J. Stephen Lang
Charles W. Jacobsen
Lesley Rees
Jennifer Reed
Andrew Murray
Graham MacKay
W. Somerset Maugham
Gloria Mehlmann
Iza Trapani
Robert L. Ludke
William Ellis
John Falconer
The Research Unit for Political Economy
David M. Carballo
Lauren Porosoff
Fanny Kelly
Andrea Most
R. H. Helmholz
Thomas Thomas Nelson
Cindy Martinusen Coloma
Kristin Otto
Constantin Willems
Elizabeth Harrower
Martin Horak
Holly Black
Anastasia Suen
Wilfrid Whitehouse
National Geographic Learning
Samuel Hall Young
Rick Rockwell
Jeff Hood
Vicki Delany
Alfred F. Young
Jeff Lucas
Hayes, Jim
Louisa May Alcott
David C. Hoaglin
Tonya Hurley
Marci Alboher
Anahí Viladrich
National Geographic Learning
Claude Lévi-Strauss
Ky Furneaux
Ron Larson
Jeannette D. Bragger
Trevor Leggett
Wayne Shorey
Ila Keller
Mario Sanna
Roger B. Dannenberg
Brian Brushwood
Robert Ringer
George Shadrack Kamanda
National Geographic Learning