GLENN, EARL R.
Instructional tests in physics, by Earl R. Glenn and Ellsworth S. Obourn.  Illustrated by Will H. Schanck.
GLENN, EARL R. Instructional tests in physics, by Earl R. Glenn and Ellsworth S. Obourn.  Illustrated by Will H. Schanck. © on illus. & new matter; 6Feb30; A19557. Earl R. Glenn & Ellsworth O. Obourn (A); 19Aug57; R197847.
Earl R. Glenn & Ellsworth O. Obourn|A