Industry standards are created by an issuing agency and can then also be "approved" by a larger national or international organization (such as ANSI or ISO, respectively).
If the ISU Library does not own the specific standard you want/need, one alternative might be to use an equivalent standard from another organization. For example, API Standard 2543 was also issued as ANSI Z11.172-1965 and ASTM D1086-1964.
Equivalent standards rarely have a different title, or any changes in the text, they are usually just reprinted by another standards organization; however, there are times when a specific standard will be modified slightly when reissued and approved by another organization. For class assignments, students usually don't need a specific standard as long as it's similar in content to one they know about. For other uses, such as in legal cases, the researcher will want the exact standard and an equivalent one will not be acceptable.
How to locate equivalent standards:
Cross reference lists available in the Standards Center, Room 161 Parks Library: