Text ( visual ) : unmediated Rational bases for "potential" and transport cost models of location / T. Nicolaus Tideman. -- Cambridge, Mass. : Harvard University , [1968]. -- 9 leaves ; 28 cm. -- (Discussion paper ; no. 38). -- "October 1968." ; At head of title: Program on Regional and Urban Economics ; Includes bibliographical references (leaf 9). -- (BB04105828) ; https://ci.nii.ac.jp/ncid/BB04105828 Author Heading(s): Tideman, T. Nicolaus. -- Classification(s): LCC : HT390. -- Subject Heading(s): LCSH : Freight and freightage -- Mathematical models ; LCSH : Industries -- Location -- Mathematical models