The Hawaiian Journal of History is freely available here up to the 2017 issue. Use the search box on the right side of the page.
When I searched for PUERTO RICANS, I found this article "Trabajo y Tristeza - 'Work and Sorrow': The Puerto Ricans of Hawaii 1900 to 1902" by Blaise Camacho Souza vol. 18 (1984), https://evols.library.manoa.hawaii.edu/bitstream/10524/393/1/JL18174.pdf