DNA-based population density estimation of black bear at northern Mexico: A preliminary study von Aacute valos Ramiacute rez, R, Mijangos Araujo, Joseacute, L, Zarate Ramos, J J, Martinez Muntilde oz, A, Salinas Meleacute ndez, J, A, Chaacute vez Briones, Mariacute a De L, Riojas Valdeacute s, Victor M

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