Proceedings of the second Pan American scientific congress : legal and economic factors in the conservation of oil and gas / by Johnson, Roswell H.

Subjects:

Proceedings of the second Pan American scientific congress : tanning materials from native source in Latin American countries / by Norton, Thomas H.

Subjects:

Proceedings of the second Pan American scientific congress : dyestuffs from materials native to Latin-American countries / by Sadtler, Samuel P.

Subjects:

Proceedings of the second Pan American scientific congress : apuntes sobre la riqueza minerológica de Venezuela / by Jiménez, Germán

Subjects:

Proceedings of the second Pan American scientific congress : extension y posible explotación de los depósitos de borato en la Argentina / by Hermitte, Enrique M.

Subjects:

Proceedings of the second Pan American scientific congress : coal fields of the United States considered as sources of supply for the western hemisphere / by Campbell, Marius R.

Subjects:

Proceedings of the second Pan American scientific congress : the cement industry and its future development / by Eckel, Edwin C.

Subjects:

Proceedings of the second Pan American scientific congress : reseña geológica del departamento de Cundinamarca, cordillera oriental de los Andes colombianos / by Lleras Codazzi, Ricardo

Subjects:

Proceedings of the second Pan American scientific congress : geología general de la República de El Salvador, en lo que se relaciona con la minería / by Fleury, Luis

Subjects:

Proceedings of the second Pan American scientific congress : cooper in America / by Weed, Walter Harvey

Subjects:

Proceedings of the second Pan American scientific congress : buying and selling nonferrous metals of South America / by Vogelstein, Ludwig

Subjects:

Proceedings of the second Pan American scientific congress : recent progress in electrical smoke precipitation / by Cottrell, F. G.

Subjects:

Proceedings of the second Pan American scientific congress : organization and cost of geological surveys / by White, David

Subjects:

Proceedings of the second Pan American scientific congress : explosives for use in industrial and commercial developments / by Munroe, Charles E.

Subjects:

Proceedings of the second Pan American scientific congress : water and disease / by Mason, W. P.

Subjects:

Proceedings of the second Pan American scientific congress : practical difficultives of conserving our fuel supply / by Burraws, J. S.

Subjects:

Proceedings of the second Pan American scientific congress : the phosphate resources of the United States / by Mansfield, George Rogers

Subjects:

Proceedings of the second Pan American scientific congress : conservation of iron ore / by Leith, C. K.

Subjects:

Proceedings of the second Pan American scientific congress : the conservation of phosphate rock in the United States / by Phalen, W. C.

Subjects:

Proceedings of the second Pan American scientific congress : ore dressing / by Richards, Robert Hallowell

Subjects: