id	keyword
amq-147	south
amq-147	america
amq-147	hippidion
amq-147	prado
amq-147	equus
amq-147	alberdi
amq-147	south america
amq-147	horses
amq-147	j.l
amq-147	species
amq-147	et al
amq-147	m.t
amq-147	argentina
amq-147	pleistocene
amq-147	del
amq-147	prado j.l
amq-147	macfadden
amq-147	alberdi m.t
amq-147	fossil
amq-147	north
amq-147	aires
amq-147	buenos
amq-147	new
amq-147	neogeus
amq-147	quaternary