William J. Duiker/ Jackson J. Spielvogel
(29)
Jackson Spielvogel (The Pennsylvania State University),William Duiker (The Pennsylvania State University)
(3)
Hugh Jackson Lawlor William King
(2)
John H. Jackson,William J. Davey,Alan O. Sykes
(2)
Thomas William 1867-1934 Jackson
(2)
William Jackson Johnstone
(2)