"pratt, gordon . "
information economics:costs and prices of machine-readable i: nformation in europe/ gordon.. pratt - 1 ed. - uk : aslib 1976. - "v, 115p.; 30 cm." - european user series 2 .
85142 078 8
Z674.5.E8 / .I54 1976
information economics:costs and prices of machine-readable i: nformation in europe/ gordon.. pratt - 1 ed. - uk : aslib 1976. - "v, 115p.; 30 cm." - european user series 2 .
85142 078 8
Z674.5.E8 / .I54 1976