hollow concrete block
hollow masonry unit
- international association of computer professionals
- international association of computer programmers
- international association of computer science and information technology
- international association of concrete repair specialists
- international association of conference center administrators
- international association of conference centers
- international association of consumer food organizations
- international association of contact lens educators
- international association of contemporary iraqi studies
- international association of cooks for christ
- international association of coordinate measuring machine manufacturers
- international association of coroners and medical examiners
- international association of corporate and professional resources
- international association of correctional officers
- international association of costume
- international association of counseling hypnotherapists
- international association of counselors and therapists
- international association of counterterrorism & security professionals
- international association of crafts and small and medium-sized enterprises
- international association of credit portfolio managers
- international association of crime analysts
- international association of culinary professionals
- international association of cystic fibrosis adults
- international association of democratic lawyers iadl
- international association of dental students