http://eric.ed.gov/?q=smsg&ff1=pubBooks
If you've heard of the "new math" of the 1960s but don't know exactly what that was, ERIC has a great collection of the "School Mathematics Study Group" (SMSG) textbooks that were at the foundation of new math.
If you've heard of the "new math" of the 1960s but don't know exactly what that was, ERIC has a great collection of the "School Mathematics Study Group" (SMSG) textbooks that were at the foundation of new math.