This report used "annual peak-discharge records at fifty sites with five or more years of record" to determine individual site frequency curves. It includes several maps.

This home movie documents the Ray family 's visit to Puerto Rico in April 1978 and includes footage of the family on the beach.

This home movie documents the Ray family 's visit to Puerto Rico in April 1978 and includes footage of a live stage performance, views of the city, and peacocks.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The Flying Wallendas perform as scheduled Wednesday night at the Pan America Circus in San Juan, Puerto Rico, despite the fatal fall of Karl Wallenda in the morning as he attempted to walk a tight rope between two tall buildings."

Abstract: The principal chemical, physical and biological characteristics, as well as the hydrology of Laguna Tortuguero, Puerto Rico, were studied from 1974-75. The lagoon, with and area of 2.24 square kilometers and a volume of about 2.68 million cubic meters, contains about 5 percent of seawater. Drainage through a canal on the north side averages 0.64 cubic meters per second per day, flushing the lagoon about 7.5 times per year. Chloride and sodium are the principal ions in the water, ranging from 300 to 700 mg/L and 150 to 400 mg/L, respectively. Among the nutrients, nitrogen averages about 1.7 milligrams per liter, exceeding phosphorus in a weight ratio of 170:1. About 10 percent of the nitrogen and 40 percent of the phosphorus entering the lagoon is retained. The bottom sediments, with a volume of about 4.5 million cubic meters, average 0.8 and 0.014 percent nitrogen and phosphorus, respectively.

Abstract: Lajas Valley is plagued with problems of salinity and waterlogging the soils. Use of brackish (500 milligrams per liter) irrigation compounded ground water for the problem until an irrigation-drainage system was constructed in 1955. Lajas is an alluvium-filled limestone highlands. The alluvium, mostly clay and as much 300 feet (90 meters) thick, contains brackish ground water except in the recharge areas located along the foothills...Results from a digital model show that a network of discharge wells could alleviate waterlogging of the soils in the artesian area.

Abstract: Laguna La Torrecilla, Laguna de Pinones, Laguna San Jose, and Laguna del Condado, in the San Juan, Puerto Rico area, are located within a metropolitan area of more than 1 million people. Bathymetric maps made during the study, in 1973, showed that Lagunas La Torrecilla, San Jose, and del Condado have been modified by dredging and filling; whereas, Laguna de Pinones has remained in a near natural state. Laguna La Torrecilla has been dredged to a depth, in places, of about 18 metres, and Lagunas San Jose and del Condado, in places to about 11 meters. Dredging in the San Juan lagoons has been harmful, beneficial, and in a few instances has had little or no noticeable effect on the water quality. Usually, dredging in the connecting canals has been beneficial if the water entering the lagoons through the canals was of better quality than the water in the lagoon. Dredging in the mouths of lagoons has been beneficial; whereas, filling or blocking the mouths has been harmful.

From introduction: A post-drought analysis of the sources of water supply for the metropolitan area indicated a need for better knowledge of the ground-water resources. A study was implemented through the cooperative water-resources investigation program between Commonwealth agencies of Puerto Rico and the U.S. Geological Survey.

From introduction: The North Coast Limestone area is one of the two most important ground-water provinces of Puerto Rico--the other being the South Coast Alluvial aquifer. The investigation of the water resources of the South Coast has progressed to the point that at this time (mid-1971) an electric-analog model of the area is being prepared. The hydrology of the North Coast Limestones, however, was never investigated as a whole before this investigation, and, therefore, this study was designed to assess the most important hydrolic features of the area.

From introduction: This report presents observed data on the interlagoon and ocean exchange of the flows of water, sediment, and selected chemicals for a tidal cycle in January 1974.

Photograph of a scene from the Hocker Family's vacation to Cataño, PR.

Photograph of a scene from the Hocker Family's vacation to Cataño, PR.

Photograph of a scene from the Hocker Family's vacation to Cataño, PR.

Photograph of a scene from the Hocker Family's vacation to Cataño, PR.

Photograph of the Bacardi Rum Distillery, in Cataño, PR.

Photograph of a scene at a fort, from the Hocker Family's vacation to Cataño, PR.

Jacket of magenta and floral batik print. No collar, center front opening with no closure. Long sleeves. Padded shoulders. All-over channel quilting in horizontal lines. Piping on all edges. Designer's label inside at back neckline: Ana Colón Size label: 6

Photograph of a scene from the Hocker Family's vacation to Puerto Rico.

Photograph of a scene from the Hocker Family's vacation to Puerto Rico.

Photograph of a scene from the Hocker Family's vacation to Puerto Rico.

Photograph of a scene from the Hocker Family's vacation to Puerto Rico.

Photograph of a scene from the Hocker Family's vacation to Puerto Rico.

Photograph of a scene from the Hocker Family's vacation to Puerto Rico.

Photograph of a scene from the Hocker Family's vacation to Puerto Rico.