A number of resources from the Yale Divinity Library's Day Missions Collection have been digitized and are publicly available. See the Day Missions Collection Digitization Projects page for more information.
The Yale Divinity Library holds approximately 25,000 missionary postcards. These postcards were produced by mission sending agencies and distributed throughout Europe and America with the intent of promoting support for the missions' work and providing information about non-Western peoples and customs.
More than 5,000 postcards have been digitized and are accessible via the following two websites:
Yale Divinity School Library
409 Prospect Street
New Haven, CT 06511