00568nam a2200193Ia 4500 CTU_218871 210402s9999 xx 000 0 und d 621.47 W749 Wilson, John I. B. Solar energy John I. B. Wilson New York Wykeham Publications 1979 Researching about importance of the sun in our life Solar energy,Năng lượng mặt trời Nguyên Trung tâm Học liệu Trường Đại học Cần Thơ