. "Conference papers and proceedings" . . . . . . . "Geodetic Operations in the United States 1909-1912 : a report to the 17. general conference of the International Geodetic Association" . "Report to the 17th General Conference of the International Geodetic Association" . . . . . . . . "Geodetic operations in the United States, 1909-1912 : a report to the Seventeenth General Conference of the International Geodetic Association" . . "Geodetic operations in the United States, 1909-1912, a report to the 17th general conference of the International geodetic association, by O. H. Tittmann" . "Report to the Seventeenth General Conference of the International Geodetic Association" . "Earth (Planet)" . . . . "Internationale Erdmessung. Allgemeine Conferenz" . .