Beekman, J.H. (zwanen)

Food finding : on the trail to successful reproduction in migratory geese / Jouke Prop ; [in collaboration with J.H. Beekman ... et al. ; fig.: Dick Visser ... et al. ; photogr.: Jouke Prop ... et al. ; drawings: Eduard Koopman ... et al.]schema:ProductModel Food finding : on the trail to successful reproduction in migratory geese / Jouke Prop ; [in collaboration with J.H. Beekman ... et al. ; fig.: Dick Visser ... et al. ; photogr.: Jouke Prop ... et al. ; drawings: Eduard Koopman ... et al.]schema:ProductModel Knobbelzwanen in Noord- en Zuid-Holland : een modelmatige benadering van de aantalsontwikkeling bij verschillende beheerscenario's / B.S. Ebbinge, J.A.P. Heesterbeek & J.H. Beekmanschema:ProductModel