Fundamentals of AutoCAD release 14Steven B. Combs, Ph.D., Jay H. Zirbel · First published 1998Open the Tome
The illustrated 3D studio quick reference R4Jay H. Zirbel, Steven B. Combs, Ph.D. · First published 1996Open the Tome
Outlines for 4-H club grain grading demonstrationsWillis B. Combs · First published 1954Open the Tome