Text ( visual ) : unmediated Urban systems : towards an explorative model / Marcial Echenique. -- London : Centre for Environmental Studies , 1969. -- 87 p. : ill. ; 30 cm. -- (University working papers ; CES UWP 2). -- Bibliography: p. 83-87 ; Description based on Reprint, 1971. -- (BA34449002) ; https://ci.nii.ac.jp/ncid/BA34449002 Author Heading(s): Echenique, Marcial ; Centre for Environmental Studies (Great Britain). -- Classification(s): LCC : HT153 ; DC19 : 307.7/6/0724. -- Subject Heading(s): PRECIS : Urban regions. Mathematical models ; LCSH : Cities and towns -- Mathematical models

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