Louden's Quality Criterion

[Greatday]

Hoping someone might be able to help me out here! I'm trying - for my own education - to replicate M.M.Loudens(71) result. Off to a bad start with the unfortunate reply from my research librarian: "Your request has been cancelled by the interlibrary loan staff for the following reason: We have exhausted all possible sources. No library is able to supply this item." After looking around I got some general idea as to how the criterion was chosen, but while I get the same qualitative result, it is still quantitatively slightly off. Anyone have a suggestion for a reference which might provide the details?

Thanks!!