Ilmu hidrologi berhubungan dengan keterdapatan dan pergerakan airv di atas dan melalui permukaan bumi.
ELEMENTARY SET THEORY,SYSTEMS OF NUMERATION,THE NATURAL NUMBERS AND THE WHOLE NUMBERS: ADDITION AND MULTIPLICATION,THE NATURAL NUMBERS AND THE WHOLE NUMBERS: SUBTRACTION, DIVISION, AND ELEMENTS OF NUMBER THEORY,THE NON NEGATIVE RATIONAL NUMBERS.
THE SAP80 USERS GUIDE,THE SAP80 INPUT DATA FORMATS,REFERENCES.
EDITOR'S,CONCEIVING COOPERATIVE EDUCATION,PLANNING AND IMPLEMENTING COOPERATIVE EDUCATION,ROLE OF THE COORDINATOR.