Chemical additives for fracturing fluid for use in oil and gas wells

COMPUTER ASSISTED INSTRUCTION SYSTEMS COMPOSED OF COMPUTER HARDWARE AND LOCAL AND GLOBAL COMPUTER NETWORK; COMPUTER SOFTWARE TO PRODUCE AND MANAGE TEACHING MATERIALS COMPOSED OF MULTIMEDIA DATA, MANAGEMENT OF INFORMATION RELATING TO THE ACHIEVEMENT AND/OR DEVELOPMENT OF STUDENTS, SELF-LEARNING IN THE FIELD OF EDUCATION, PARTICULARLY FOR COMPUTER AIDED EDUCATION

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