Instructions for using the U.S. Geological Survey data base of wells on Long Island, New York

The population of central and eastern Long Island, New York depends on ground water for its supply of fresh water. Data on more than 7,500 wells on the island have been collected by various State and local agencies and compiled by the U.S. Geological Survey since 1906. During 1975-81, the Geological Survey developed a data base for its Data General Nova 1220 minicomputer to store and process the well information. The data base is composed of seven sections, each of which may be revised and updated. Three types of magnetic devices with limited capacity are used for data storage--disk, Linctape, and 9-track tape. This breakdown makes each section small enough to store and update on a small minicomputer while allowing simultaneous data retrieval from all sections. This manual gives complete instructions for revising, storing, and retrieving well data. Most programming is in FORTRAN, but some is in assembly language. (USGS)