por Weast, Robert C, 1916- [editor] | Chemical Rubber Company (Firma comercial).
por Astle, Melvin J [editor] | Weast, Robert C, 1916- [editor] | Beyer, William H [editor].
por Weast, Robert C, 1916- [editor] | Astle, Melvin J [editor].
por Astle, Melvin J | Weast, Robert C, 1916- [editor].
por Weast, Robert C, 1916- [editor].