Research circular - Ohio Agricultural Experiment Station.

Mode of access: Internet.

Bulletin - Virginia Agricultural Experiment Station.

Mode of access: Internet.

The College of Engineering and Engineering Experiment Station of the University of Illinois. A pictorial description.

Mode of access: Internet.

Report of work of the Agricultural experiment station of the University of California ...

1904/05-1911/12 included in President's general report of University of California for those years.

Experiment station research facilities, report to accompany H. R. 12712.

Caption title.

16th census of the United States: 1940. Población. Boletín núm. 1-[3] ... Puerto Rico.

Nos. 2-3 have title: Censo décimosexto de los Estados Unidos: 1940.Puerto Rico. Población ....

Annual book on statistics of Puerto Rico.

Mode of access: Internet.

Report of Northwest Experiment Station, Crookston.

Mode of access: Internet.

Bulletins of the Agricultural Experiment Station, University of Illinois.

Mode of access: Internet.

Annual report of the University of Wyoming Agricultural Experiment Station.

Report year ends June 30.

Bulletin - Maine Agricultural Experiment Station.

Mode of access: Internet.

Hydrologic study. Western Division, South Coast Irrigation District for Puerto Rico Water Resources Authority,

Mode of access: Internet.

Prehistoria de Puerto Rico

Mode of access: Internet.

La isla de Puerto-Rico (primera parte) : bosquejo histórico, desde la conquista hasta principios de 1891 /

"Apéndice: Organización política, económica y administrativa de Puerto Rico. Legislación vigente en 1891": p. [2-5] at end.

Parnaso antillano : compilación completa de los mejores poetas de Cuba, Puerto Rico y Santo Domingo /

Mode of access: Internet.