Autor: Robert schmitt, 3 titluri

Moving the Earth: Excavation Equipment, Methods, Safety, and Cost, Seventh Edition

Robert Schmitt,Clifford J. Schexnayder,Aaron Cohen,Herbert Lownds Nichols,David Day

Manual de punere in practica a principiilor din Sistemul Maestrului - Anthony Michalski, Robert Schmitz

Anthony Michalski,Robert Schmitz

Historical Dictionary of Yemen

Charles Schmitz,Robert D. Burrowes