Consequences of relative land scarcity / Nel van HekkenConsequences of relative land scarcity / Nel van Hekken and Bonno Thoden van VelzenConsequences of relative land scarcity / Nel van HekkenConsequences of relative land scarcity : seminar on changes in Tanzanian rural society and their relevance for development planning, Leiden, 7-11 December, 1970 / paper pres. by Nel van Hekken a.oLeven en werken in een Nyakyusa dorp / P.M. van HekkenLand scarcity and rural inequality in Tanzania : Some case studies from Rungwe District / [by] P. M. van Hekken [and] H. U. E. Thoden van Velzen [Afrika-studiecentrum, Leiden]The ten-house groups in Ngamanga / P.M. van Hekken ; [transl. from the Dutch by V.A. February]Echtscheiding bij de Nyakyusa / P.M. van Hekken, K. de JongeRelative landscarcity and rural inequality / by P.M. van Hekken and H.U.E. Thoden van VelzenLeven en werken in een Nyakyusa dorp / P.M. van HekkenLeven en werken in een Nyakyusa dorp / door Pieternella Maria van Hekken