The Sibley-Munroe checklist was a landmark document in the study of birds. It drew on extensive DNA-DNA hybridisation studies to reassess the relationships between modern birds.
... Signals Directorate (DSD)
Brazil
Agência Brasileira de Inteligência (ABIN)
Serviço Nacional de Informações (SNI) (Defunct)
Bulgaria
Durzhavna Sigurnost[?] ...