http://www.archive.org/details/firstgrammarofla00seidrich (Publisher version)
bontocigorot_seidenadel1909_o.pdf (Publisher version), 30MB
Seidenadel, C. W. (1909). The first grammar of the language spoken by the Bontoc Igorot, with a vocabulary and texts, mythology, folklore, historical episodes, songs. Chicago: Open Court Publishing.