http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
device for automatic photoelectric control of the analytical gap for emission spectrographs
iii, 5 pages : illustrations, diagrams ; 27 cm.
by John A. Dietrich, Elmo F. Cooley, and Kenneth J. Curry.