Institute of Space and Astronautical S… 
Institute of Space and Astronautical S… 
Institute for Space and Aeronautical S… 
Institute for Space and Astronautical… 
Institute of Space and Aeronautical Sc… 
Illinois State Academy of Science 
Independent Schools Accreditation Sche… 
Individual Support Annexes 
Institute for Space and Astronautic Sc… 
Institute for Space Astronautics and S… 
Institute of Southern African Studies 
Institute of Space and Aeronautical Sc… 
Institute of Space and Atmospheric Sci… 
Institute of Spectrochemistry and Appl… 
integrated service agencies 
integrated small artillery synthesis 
Integrated Spacecraft Avionics System 
Intelligent Student Advisement System 
Intelligent Systems and Semotics 
Interim Storage Areas 
International School for Advanced Stud… 
International Schools Association 
International Security Agreements Syst… 
International Society of African Scien… 
International Standardization Agreemen… 
International Standards on Auditing 
Iowa Satisfaction with Anesthesia Scal… 
Isotopic Source Assay System