McGraw Hill Companies (COR)/ National Geographic Society (U. S.)/ Alton Biggs/ Lucy Daniel/ Ralph M. Feather Jr. Ph.D.
(1)
National Geographic Society (U. S.)/ Alton Biggs/ Lucy Daniel/ Ralph M. Feather Ph.D./ Susan Leach Snyder
(1)
Ralph M. Feather Jr./ Charles William McLaughlin/ Marilyn Thompson
(1)
Ralph M. Feather/ Susan Leach Snyder/ Dinah Zike
(1)