I attached a link to my academia.edu site where I posted my recently published article: "Radiotelegraphy to Broadcasting: Wireless Communications in Porfirian and Revolutionary Mexico, 1899-1924"  Mexican Studies/Estudios Mexicanos, 29, no. 2 (Summer 2013: 335-365.
I discuss Rolland's involvement in radio in the 1910s and 1920s.


http://www.academia.edu/2092931/Radiotelegraphy_to_Broadcasting_Wireless_Communications_in_Porfirian_and_Revolutionary_Mexico_1899-1924


Best,
Justin Castro