offical index period
Office of Industrial Programs
Office of International Programs
Operating internal pressure
Operational Improvement Program
Operations improvement program
Operations Integration Panel
Operations Interface Procedure
Optical Information Processing
Optimized Inner Projection
Obligate Intracellular Parasite
Office of Information and Privacy
Office of Information Practices
Office of Information Programs
Office of Infrastructure Protection
Offset Instrumentation Point
Oil Pressure
Oil-in-Place
Ontario Institute of Painters
Open Internet Platform
Operations Interface Procedures
Operator Implementation Plan
Operator Interface Processor
Operators Implementation Plan
Ophthalmomyiasis interna posterior
Optical Image Processing
Optical Improvement Program
Orbit Improvement Program
Orbit Insertion Point
Organization Inspection Program
organizing interstitial pneumonia
Oriental Institute Publications
Osdorp Internet Posse
Other Interested Party
Ovamboland Independence Party
Overhaul Inspection Procedure
Observatorio Internacional de Prisiones
of International Programs
of the Iraq Programme
Office of Institutional Planning