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
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