Champa by R.C. Majumdar Volume I of the "Ancient Indian Colonies in the Far East Series" dealt with the Kingdom of Champa, more "indianized" than Angkor. In English
L'art khmer primitif [Earlier Khmer Art] by Henri Parmentier Monumental work on pre-Angkorian art from Udon to the Mekong Delta with Sambor Prei Kuk as hypothetical center. In French
New Journeys in Old Asia by Helen Churchill Candee & Lucille Sinclair Douglass Back to Cambodia four years after "Angkor the Magnificent", an inspired and sometime visionary travelogue through Asia in the throes of colonialism. In English