Bulletins on the rubber producing capacity of the Philippine Islands - Ahern, George Patrick; Sherman, Penoyer; United States. Bureau of Insular Affairs (Washington Government Print. Off., 1907)
Letter from the Secretary of War -- The gutta-percha and rubber of the Philippine Islands / by Penoyer L. Sherman, Jr. (Bulletin 7, Bureau of Government Laboratories, Philippine Islands) -- A compilation of notes on India rubber and gutta-percha / by Capt. George P. Ahern (Bulletin 3, Bureau of Forestry, Philippine Islands)
Cover title.
Keywords: Rubber; Gutta-percha.