000 00434nam a2200169 4500
001 18783/75
005 20130515015743.0
008 111112s9999 xx 000 0 und d
082 0 0 _a551. 3 uni
100 1 _a"0, . "
245 1 0 _ascience:a second level course environment:
_brivers and lakes/
_c ..
250 _a1 ed.
260 _auk :
_bthe open unversity
_c1972.
300 _a", 72p.;
_c30 cm."
504 _a
650 0 _a
_x
999 _c55384
_d55384