computer programs for use in data base management for use in the natural gas, chemical and refining industries

'base':7 'chemic':15 'comput':1 'data':6 'gas':14 'industri':18 'manag':8 'natur':13 'program':2 'refin':17 'use':4,10

computer program instructional manuals for computer programs for use in data base management for use in the natural gas, chemical and refining industries

'base':12 'chemic':20 'comput':1,6 'data':11 'gas':19 'industri':23 'instruct':3 'manag':13 'manual':4 'natur':18 'program':2,7 'refin':22 'use':9,15

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