Description and chemical composition of manganese nodules in a core located in the Nares Abyssal Plain, Atlantic Ocean

Three nodules from a core taken north of Puerto Rico are composed chiefly of an x-ray amorphous, hydrated, iron-manganese oxide, with secondary goethite, and minor detrital silicates incorporated during growth of the nodules. No primary manganese mineral is apparent. The nodules are enriched in iron and depleted in manganese relative to Atlantic Ocean averages. The formation of these nodules appears to have been contemporary with sedimentation and related to volcanic activity.

1977 economic censuses of outlying areas.

Includes earlier editions of some vols.

Memorandum.

Mode of access: Internet.

Luis Muñoz Rivera : discurso /

Mode of access: Internet.

En la arena /

"Datos biográficos de Francisco Gonzalo Marín (Pachín) (1863-1897), tomados del ʻBoletín Histórico de Puerto Rico'": pp.7-21.

Rosas blancas.

"Traducciones del inglés": p. [113]-154.

Trayectoria del pensamiento liberal puertorriqueño en el siglo XIX /

Includes bibliographical references.

Annual report.

Size varies.

Insumo producto; Input output.

Mode of access: Internet.

Program of on-the-job training facilities for veterans; list of approved establishments.

Mode of access: Internet.

Program of on-the-job training facilities for veterans; list of approved establishments

Mode of access: Internet.

Program of on-the-job training facilities for veterans; establishments eliminated from the lists of approved facilities.

Mode of access: Internet.

Informe de recursos humanos /

Description based on: 1971 1972 1973.

Estado de empleo de la población civil no institucional. Employment status of the civilian noninstitutional population.

Mode of access: Internet.

Multivariate statistical analysis of highway accident and highway conditions. Final report.

Transportation Department, Office of University Research, Washington, D.C.