prepared under the direction of the ASM Committee on Gas Carburizing. compiled under the direction of the Committee on Manual. prepared under the direction of the Committee on Personnel Advancement prepared under the direction of the chief of engineers. prepared under the direction of the American Geological Institute. prepared under the direction of the ASM Handbook Committee ; edited by Taylor Lyman. prepared under the direction of the ASM Handbook Committee. prepared under the direction of an Editorial Board. prepared under the direction of the ASM Handbook Committee ; edited by Howard E. Boyer. prepared under the direction of the ASM Handbook Committee ; William H. Cubberly, director.