What does ACCOP stand for?

Aconitum columbianum Nutt. ssp. pallidum Piper - Scientific name - Accepted name: Aconitum columbianum ssp. columbianum - Family: Ranunculaceae - USDA National Plant Data Center symbol - Botany - Taxonomy (USDA)

Canadian Occidental Petroleum Ltd., Calgary, Alberta - Library symbol - National Library of Canada (NLC)