The Ernest P. Imle Papers include subject files, photographs, reports, and articles about U.S. Department of Agriculture (USDA) rubber research from the 1940s to the 1970s, primarily at the Regional Rubber Experiment Station in Costa Rica. Additionally, there are articles and correspondence on tropical agriculture, including cacao, and publications on lilies. This collection has not been fully processed, therefore the container list is a draft and will change once processing is completed.