00645cam a22002174a 4500 051121s2006 dcuab b 001 0 eng 0309092086 0309531918 9780309092081 9780309531917 SDU BF723.S63 L438 2006 Learning to think spatially. Washington, D.C. : National Academies Press, 2006. 313 p. : ill. Space perception Study and teaching. 190955 Geographic information systems. National Academies Press (U.S.) 187834 = C.1 SDU GBE lcc 103247 103247 0 0 lcc 0 BF0723 S63 L438 02006 0 CGB 281577 SDU SDU GEN3 2025-09-11 2 0 BF723.S63 L438 2006 1000374604 2025-09-11 00:00:00 C.1 2025-09-11 GBE