What kind of education does nursing school classify as?

I need to fill out some forms asking about my mother's education but I can't find anywhere what sort of schooling/degree she technically has. She went to nursing school in the 70s before the training required college and the like. So basically she's an RN, but never attended college...she went to Mass General's school of nursing while it existed, but since it is now a graduate school I can't seem to find what they'd call a nursing degree.

Anyone know what I'm talking about? (someone older perhaps..)

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