From my knowledge of the Kress-Goldsmith collection, most of the attributions (and especially the wrong ones) made in the catalog can be traced back to Henry Higgs's famous (though now outdated) Bibliography of economics published in 1935. Kenneth Carpenter is probably the man to contact to know more about the precise procedure followed to make the Kress-Goldsmith collection catalog (he was chief-librarian of the Kress collection for several years). Lo?c Charles