Elements of linear programming : with economic applications / by R. C. Geary and J. E. Spencer. Geary, Robert Charles, 1896- Spencer, John E. (John Ervine), jt. aut. Linear programming. Economics, Mathematical. HB143 .G4 1973 519.92 GEE Includes index. London : Griffin, 1973. 1973. 1973 Text 138 p. : eng Griffins' statistical monographs and courses, no. 15