The spelling of English by Porto Rican pupils,

Mode of access: Internet.

La reforma universitaria : discurso pronunciado el dia 15 de febrero de 1943 por el senor rector de la universidad /

Cover title.

Bulletin /

Mode of access: Internet.

Research program on the sea otter (Enhydra lutris) and its environment /

Mode of access: Internet.

The Caribbean forester.

"Planned as a medium of exchange of knowledge between those interested in forestry in the islands and countries in or near the Caribbean Sea."

Report of the Board of Commissioners of Agriculture of Porto Rico for the period from ...

At head of title: Government of Porto Rico, Board of Commissioners of Agriculture.

U.S.D.A. Forest Service research note ITF.

Mode of access: Internet.

Forest Service research paper ITF.

Mode of access: Internet.

Rhizophora mangle L., Rhizophoraceae : red mangrove, mangrove family /

"SO-ITF-SM-2."

The ecological life zones of Puerto Rico and the U.S. Virgin Islands,

Summary in Spanish.

República literaria y dialogo de las locuras de Europa /

Palau incluye esta obra como el t. IV de "Idea de un príncipe político cristiano representada en cien empresas"

Michalelis Mercati ... Metallotheca : Opus posthumum, auctoritate, & munificentia Clementis Undecimi pontificis maximi e tenebris in lucem eductum /

Appendix ad Metallothecam Vaticanam Michaelis Mercati ..., 53 p.

Obras de Rabindranath Tagore.

Set made up of various editions.

The Journal of agriculture of the University of Puerto Rico.

Mode of access: Internet.

Autógrafo epistolar inédito de Santa Teresa de Jesús en el que reiteradamente alude á su padre, don Alonson Sanchez de Cepeda,

"Informes publicados en el 'Boletín de la Real Academia Historia de la Historia, 'tomo LXVIII, cuadernos de septiembre-octubre y noviembre de 1915 (con excepción de la Noticia preliminar y los Apéndices)"