G. Alan Tarr & Frank P. Grad 
State Constitutions for the Twenty-first Century, Volumes 1, 2 & 3 [PDF ebook] 

State Constitutions for the Twenty-first Century, Volume 1
The Politics of State Constitutional Reform
State Constitutions for the Twenty-first Century, Volume 2
Drafting State Constitutions, Revisions, and Amendments
State Constitutions for the Twenty-first Century, Volume 3
The Agenda of State Constitutional Reform

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