00302nam a2200097Ia 4500008004100000082002200041100002200063245007500085260003700160300000700197140113s9999    xx            000 0 und d  a591.51:598.2   L3  a"Mathews, G.V.T,"  aOrienation and position finding by Birds(Oxford biology readers NO.38)  a1973bOxford Univ. PresscMadras  a16