This commentary is based on extensive original research. The author has examined archival collections of correspondence and reports, plans and related planning documents, contemporary newspaper accounts of key events, and published material on local and international planning history. He also conducted several dozen interviews with participants and observers. Citing all the sources for each statement or argument seemed cumbersome and inappropriate in a pamphlet such as this, so source citations have been limited to the key primary documents and a few critical or under-recognized published works. A full bibliography and reference apparatus will be published in the book from which the contents of this Commentary are drawn.