Circular de Plínio [Marques da Silva] Ayrosa a Gleb Wataghin

Circular de Romesh Chandra a [Mario Schenberg]

Circular de Rubião Meira a Giuseppe Occhialini

Circular de Ruy Bloem a Abrahão de Moraes

Circular de Ruy Bloem a Giuseppe Occhialini

Circular de Ruy Bloem a Giuseppe Occhialini

Circular de Ruy Bloem a Giuseppe Occhialini

Circular de Ruy Bloem a Giuseppe Occhialini

Circular de Ruy Bloem a Giuseppe Occhialini

Circular de Ruy Bloem a Giuseppe Occhialini