Part of the reason for the confusion is that in the midst of the turmoil of the early 1970s, Tau Delta Phi was down to one remaining chapter at New York Polytechnic. Many chapters had just closed, Illinois merged with Pi Lambda Phi, Penn State merged with Tau Epsilon Phi and Lehigh became a chapter of Zeta Psi (there may be others that also merged with a stronger group on campus). The remaining chapter at NY Poly then began expanding around the New York City area, and there are now about a dozen or more chapters active, although I have never seen a list of their active chapters ever published.
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