bxData=3|560|1175|2215|5110|5575|6620|7250|8355&bxLabels=Introduction|Examples|Dimensionality|The+Englishman+who+went+up+a+hill...|Origins+of+points,+lines+and+areas|+-+J.K.+Wright's+chart,+1944|+-+Robinson's+1st+Edition,+1953|+-+Robinson's+2nd+Edition,+1960|+-+Robinson's+3rd+Edition,+1969