Proceedings of the second Pan American scientid congress : engineering and scientic work of the United States Office of Public Roads and Rural Engineering / by Page, Logan Waller

Subjects:

Proceedings of the second Pan American scientid congress : agricultural implements and machinery / by McCormick, E. B.

Subjects:

Congreso Científico Panamericano (2 : 1915-1916 : Washington).

Subjects: “…AGRICULTURA-INGENIERIA RURAL COL…”